To me success isn't just about the CL, domestically Barca was great under Cruyff too playing football with similar principles. You do of course need a mixture of profiles in a squad and physicality is very key. We had those profiles too in Toure,Keita,Motta, Van Bommel, Marquez etc. We just have a terrible squad now and too many important members in the twilight of their career.
We discussed similar questions a few times in the past.
I am Rijkaard's fan and not Pep's.
Even though Pep was more dominant.
But imo, Pep killed the no9, and created a perfect one-way (possession style) and sacrificed corners, crosses, headers, physique, longshots, longballs.
Rijkaard was more all-rounder.
Pep created a team with 11 Iniestas.
If they are on form, they will trash anyone.
But if they meet some bullies in Europe of if they can't break the bus, with Pep there is no plan B in Europe.
Anyway, Pep's possession, dominant, attacking football is absolutely the best type for LEAGUE competitions.
Over 38 rounds, his teams will usually be on top.
The same is with Barca in Spain, who could have won all titles since 2009 with a bit of luck.
On the other hand, that style doesn't work in Europe, except in perfect conditions when you are miles better than everyone.
In Europe and on World cups, winners in the last 7-8 years are usually direct, lethal teams.
Germans, France, Real with crosses and Cr7, Liverpool, Bayern.
Those teams are all similar.
They are dominant, but they don't dwell on ball like Barca.
They are more direct.
They use possession, counters and crosses, unlike Barca.
They usually have a true No9, unlike Barca.
They are more physical, taller and faster than Barca.
They are more aggressive than our nice choirboys.
They have better mental strength at 0:1 or in the 90th minute where you need clutch players and bravery.
Nice guys can win over 38 rounds because there is no sudden death (knockout matches).
Less technical yet physical and aggressive teams will lose more points over 38 rounds.
So, roughly:
League championship is more about skills, technique, possession.
Champions league and world cup KO rounds are more about: boxing match, street fighting, mental strength, dirty tricks, direct football, clutch players, finding the simplest way to shoot and score (Real's crosses to Cr7 or Bayern's style, for example, where Germans often say: "you don't want to have more than 70% of possession, you are making a mistake in that case).
In that sense, theoretically, we could win La liga with 3 Puigs in midfield.
Yet, in a CL we would probably lose 7:1 to any EPL or German team.
In a CL, Barca's true style worked only in 1992, where there was only 1 team per country, where we luckily scored in the 90th minute in a round of 16, and where we won with a free kick goal from Koeman in a final.
It is hard to call that a true domination.
Rijkaard in 2006, the same.
Good football, but far from a domination.
Msn in 2015, we bypassed midfield and relied on defense and MSN magic.
Not too much in common with Pep's domination.
So, basically, our only finals with Barca/Pep's domination came when we had 6 false midfielders, Xavi-Iniesta and a GOAT Messi, in an era without too many physical teams.
So, on a European level, it is hard to say that Barca's football dominated except during the golden generation.
So, it is reasonable to ask: can that classic style win ever again in Europe?
Winning against La liga opponents is one thing.
And winning against EPL bullies, Bayern and Italians is a different world.