So are you saying the 4-3-3 is outdated or doesn't work anymore?
Real won the consecutive UCLs using Casemiro as a destroyer, Kroos as passer/controller and Modric as creator/passer. City, Bayern, and Chelsea all are using the same combo.
For us, we have a destroyer who obviously work alone in the midfield nowadays and lack pace, hence he is overrun or can be pressed to make mistakes. Raki like someone mentioned, drift toward the right to support the RB instead of working along the destroyer, control the tempo and pass the ball forward. He is also a terrible passer and lacks vision. He actually always look before he passes the ball which is in a perfect 4-3-3 I mentioned under Pep or Sarri would be considered a crime. It will slow the attack, the opposition will know where the ball is going and either press or intercept.
Coutinho as a creator has been played out of position many times. He should stick in LM and move between Busquets and closer to the box just like Iniesta. He needs to master this position.
Also, the 4-3-3 requires a huge amount of discipline from its wide players, Dembele, Malcom has to track back and help with defensive duties. Same with full backs Semedo and Alba.
The system needs a manager who knows how to implement it. Having wrong ideas, players can't implement the system or miscommunication between players and the manager could lead the team to be exposed in the defensive.
You are simplifying it.
Real's destroyer is Casemiro.
Our destroyer is thin and slow Busi.
My point is, you are trying to copy Pep's team.
1. opponents have figured out us since then
2. further, Pep had 7 key ingredients: 3 best midfielders on their prime, 3 younger attackers and a RB Alves
That is not a midfield trio, but a midfield's 7 players, more or less.
3 midfielders, 2 of them (Xavi and Iniesta) which happen once in 100 years.
Prime GOAT. Etoo running like crazy, Henry running, Pedro running.
Alves, worth like 2 players on a flank.
And, now, you are trying to replicate Pep's midfield with horribly weak copies.
And even if we move away from that fact, what about 3 hard working forwards. What about prime Messi to kill the opponents, what about 2 in 1 Dani Alves?
So, Pep had 7 amazing players working as an attacking and defensive unit.
You have some 3 weak-ish copies and 4 guys nowhere close to those guys (old Messi, old Suarez, Dembele, Roberto).
So, imo, that midfield trio has nothing to do with Pep's 7-men team.
Real has:
1. better midfielders
2. destroyer Casemiro
3. more hardworking attackers
4. Marcelo as theirs Alves
5. CR7 for scoring with feet and head
Your idea more or less doesn't have any of those 5.