@jamrock
I addressed the CB problem dozens of times, I don't see every notification and not sure about the part I didn't respond, but here we go.
I never accused Flick of being a good defensive coach btw, he defends mainly by pressing and then relying on offside trap + defenders talents. I said several times that this makes him in need of even better defenders of a regular coach. He is who he is. And he us likely the best we can get.
Bayern defense was shit btw, they weren't tailor made for him. Finished Boateng, Alba who are forced into CB (the position he always hated) and he is nothing more than a solid starter there. Kimmich who is a midfielder and Davies who is an athletic freak but was never the best defender. Other than Davies, which one of those you see as world class defender?
But more importantly, what is the solid defense you need? As JJ Redick says in Basketball, you don't need the best defense to win, but you need a defense that can make a stop when it matters. A one that doesn't lose you games.
This is where Barca lack in comparison to Bayern 2020. While they were average defense at best, when they locked in they could manage to get the stops they needed. They conceded 3 goals in 5 knockout games. 2 of them were meaningless goals against Barca, 1 meaningless goal against Chelsea.
The 39 goals conceded at Bayern isn't the "got you" number as you think. It is a mute irrelevant number, just like no one cares what is the number we conceded in total in our league winning seasons. Barca wasn't the best defense even when they had the likes of Pique, Puyol,Marquez etc. No one accused them of being bad defenders, no one accused coaches of being bad defensive coaches. Because when needed, all stepped up levels.
Same with current CB at PSG, they aren't some gods that no one can beat, but again capable of at least not being a vulnerability.
Current Barca doesn't have that, in most cases, we crumbled when we needed them, despite rest of the team stepping up.