Your biggest mistake here is the assumption that all of football history is equal in relevance. It simply isn't. Football is and has been evolving and you seem to be living in the past needing to catch up.
The reason why superior midfield play and the ability to control the game is so crucial to success these days is because that is how football evolved. When Pep and Barca rose to the top of the world, they redefined what the template for a truly elite team looks like and evolved tactics to be better suited for winning. The rise of 'Messiesque' or 'Xaviesque' short technical players everywhere in the sport of football has been a dominating trend this past decade in line with how the game is played the right way now.
I've little doubt right now that a team like the current Man City would thrash most if not all historically significant European club teams from before 2008. There's a reason why in the recent years the teams with the best technical players have been overwhelmingly successful over their lesser so rivals. RM have been playing counterattacking physical football for years but it was Kroos+Modric and the evolution into the premier midfield in Europe that got them to be back to back CL champions, never would've happened without them. Both Pep's Barca and our 14/15 team had an insane midfield + Messi who singlehandedly wins midfield battles. Heynckes Bayern also had that. City now are dominating the EPL like almost no one has ever done because of the way they adhered to Pep's system and built a roster with the best midfield and elite technical players.
Pep, Messi, Xavi. These were the pioneers but even they are NOT the whole big picture. It's not "just because we have Messi" that the technical Barca team has been successful, but rather because that is now the best way to ensure victory and other teams have been gaining a taste of Barca's success by using the same principles and similar (but worse) players. It's the key, the critical evolution of the game. And teams either adapt to it or get left behind.
It seems that you, but all of us, see only what we want to see and our fixated only on that part.
Imo, I said it numerous times, teams were shocked in 2009 and didn't know how to defend against it.
It was a shock and teams were caught off guard.
So, TikiTaka was awesome, but a huge part of it's success was that shock and how the opponents were confused.
Over the next 2-3-4 years, little by little, the opponents figured out 2 things:
1. how to defend better AGAINST Barca
2. and how to kill Barca in the most efficient way (quick counters)
And then more or less, all teams started to play in the same way against Barca.
Some fans will say:
1. no, TikiTaka didn't become less efficient. It is about our coaches, players, ageing Xavi/Iniesta.
We don't press/run/play triangles as before, whatever.
For football, you always need 2 sides.
And a part of your strength and results depends on your opponents.
If Xavi-Iniesta will play at 100% in 2009' against teams who are shocked with TikiTaka, they will win 34 matches out of 38.
If you will clone Xavi-Iniesta in the 2014 (4 years later), and let's say that Xavi-Iniesta will be of the same age as in 2009, their team won't win 34 out 38 matches, but let's say 30 out of 38 matches.
Now, the same, copy Xavi-Iniesta into 2018, and their play will win 26-28 matches out of 38.
Again, BECAUSE teams have learned how to neutralize Xavi-Iniesta type of play (park 2 buses of 4+4 players infront of your box, leave the flanks open since Barca won't cross, try to kill Barca on counters whenever possible).
Go back and look La Liga matches from 2008-09 and check how an average La Liga team defended against us in 2009 and how they defended in 2012, 2014 or 2016.
Ok, people will add: but Xavi declined, blah blah, this is why we weren't as good anymore.
Well, ok, we can't actually clone Xavi. But also, we won't ever have a new Xavi again.
So, Barca's version of declined Xavi is the best version of Barca in a current era which you can get.
1. so, we won't have a new Xavi, the brain of TikiTaka
2. plus, teams learned to neutralize TikiTaka way better than in 2009-2011 when they were shocked
About RM, this is the part imo where you see only what you want to see.
You are mentioning Kroos, Modric, Isco etc.
Now, for example, remove CR7, Benzema and Bale and put Pep's attack into RM's sides.
You will have an awesome midfield (Modric, Kroos, Isco), but you will have attacking line from 2009 with physically weak players in Jesus, Sane and similar.
Now, imagine Kross, Modric, Sane, Jesus. Lol, I don't want to imagine that team.
Park a bus against them, and they are dead.
There is no room on the ground and they don't have a plan B.
And why did Real won all these CL trophies?
= because they had a Plan B (unline Barca and Man City) and actual players who can score and win in their plan B, and those were Cr7, Benz, Morata, Bale, all players who can score both:
1. with feet (Barca's style)
2. with head (Barca can't do that)
3. longshots (Barca does that rarely)
4. corners (we suck there)
Remove Real's headers after crosses and headers after free kicks and they would win 15 points less in each season and they wouldn't win those 3 CLs.
So, Kroos and Modric DID help, but they are only A PART of a story.
Real won because they had the whole package:
1. faster, mobile, technical midfield
2. attackers able to score in a lot of ways (unlike Barca's classical short forwards)
And there it is, you see only what you want to see.
You see Real's success mostly in midfield.
While I see their success as a mix of:
1. midfield
2. attackers able to score in 3-4 different way, unlike Barca's/City's players
I mean, again imagine a team of: Coutinho-Alena-Arthur, Griezmann-Messi (and xx player).
This team will play good through the ground.
Which will be good enough against majority of La liga teams, even though we will struggle more than in 2009.
But in a CL, wehn we'll face Juve/Bayern/Atletico/Real/Psg, you'll have the same old thing as in the last 15 years, when almost in every single CL defeat, we lost to physically stronger teams.
Btw, if you'll ask me what is my dream team/dream tactics, well my dream for Barca is what a German NT team is doing (or Bayern pre-Pep):
1. playing TikiTaka (or a version of it), playing a possession based football
2. but with taller, stronger, faster (and yet technical midfielders), like German NT midfielders
3. and having attackers who are tall, strong, fast and technical (like German attackers) who can score both with feet, head, longshots and after corners
So, I am not actually dreaming about 11 Fellainis.
I am dreaming about slightly taller, stronger and faster Barca.
And so, Coutinho-Alena-Arthur is not what I want to see on a field.
If we have 1 Coutinho, we need to pair him with 1-2 stronger midfielders like Rakitic.
In attack, we can't play with guys like Munir, Arnaiz and similar. What Real and German NT is doing, imo, is a way to go.
Real still played like Barca (in midfield), right?
Germany is also playing like Barca, right?
Also, can you reply, what is your answer: why are our players falling down like 13 years old kids against some strong teams (Atletico, Psg, Juve), like in a Psg vs Barca last year:
Some fans will reply: lol, this is not because of short players. This is because of Lucho's bad tactics.
But then again, since 2000, we have lost almost every CL KO round in the same fashion.
Every year, we lost in the same way as Lucho's Barca against Psg and Juve.
I have said a lot of times that I have a feeling as watching the same match over and over for 20 years. (We play technical and nicer, they play less nice but have stronger players and we usually lose 1:2).
It is not as if we short players can never win a CL.
If we buy 3 Coutinhos and play with short players, we will probably win 1 CL in 5-6 or 10 attempts, like with MSN.
Pep, Messi, Xavi. These were the pioneers but even they are NOT the whole big picture. It's not "just because we have Messi" that the technical Barca team has been successful, but rather because that is now the best way to ensure victory and other teams have been gaining a taste of Barca's success by using the same principles and similar (but worse) players. It's the key, the critical evolution of the game. And teams either adapt to it or get left behind.
It is not as if Pep invented a technical/possession style.
We always played that way, but he brought it to an extreme level.
But imo, Pep is stuck and he isn't evolving.
As said, I would rather have a German's NT team style than Pep's city's style.
If Pep will face 2 physically stronger teams (Bayern, Juve, Psg), I don't see how he will survive.
If he will be lucky with a draw and he will face only Portos, Shakhtars and similar, he can go all the way.
But still, as always, I would like to see Pep's teams vs German-type of teams like Bayern or Real from the last 4 years.
Pep plays like Spain in 2010.
While these teams play like Germany in 2014.
That is my view on Pep's and TikiTakas evolution.
His evolution is:
1. buy even more expensive/better players for TikiTaka and do the same thing over and over
2. or raise TikiTaka to even higher/better level
The option:
3. trying a plan B or something new as a new weapon when a Plan A is not working=doesn't exist in his head
This is how I see lots of guys on this forum.
When our team is not working, instead of trying evolving or trying a plan B with a different type of attacks/players, the answer is always: we need to go back and buy Xavi's type of a controller, Iniesta's type of a player etc.
I mean, when I see someone seriously mentioning Coutinho-Alena partnership as something which could work in a CL against stronger teams in 2020, 2022 or 2025, it is really hard to even try to reply on these posts and these ideas.
So, one more time, I don't want 11 Rakitics or 11 Fellainis (even though Raki is way better).
I want some Coutinhos, but paired with some German type of players whoa re offering both some muscle and technique.
I have wrote before and I will stick to it: imo, 2009's Pep's team would struggle today and it would experience similar problems to Tata's and Luchos' teams in terms of huge problems in breaking (evolved) buses.
Buses in 2009 were on a Mickey Mouse level.
The opponents evolved.
Lots of our fans are still stuck in 2009'.