It's also really a natural progression.
We have seen under Xavi in instances everything that's working under Flick now. Raphs form and positionm, Yamal becoming worldclass (there's no difference between Flicks Yamal and Spains for example)... even the Bayern game/result was in the making. Flick just gets the credit for this, while being completely shit otherwise.
Yeees
Xavi would trash Real Madrid two times and Bayern too. He would win the Supercup and he would totally not be out of the top24 in the UCL by now. Raphinha would be one of the best players in Europe and Lewandowski would be the top scorer in all competitions. He would be first in the league and we would be on our way to the sextuple.
Easy to talk shit when you have no background to back it up. I could as well say Erik Ten Hag would win us UCL if we signed him now and you can't possibly know if that is true or not.
I know that Xavi openly admitted he has absolutely no belief in the players and he had zero ambitions for the next season which is why it was best for everyone to just sack him and get a new manager. Unsurprisingly his fanboys now fart about what could have been, should have been but it's irrelevant because he had enough time to prove himself and did not do it.