Mbappe's move was unfortunate. Lol, he still loves Real Madrid no matter where he goes, but it's still a shame that wherever Mbappe goes, PSG won the UCL and became the most feared team this season.
PSG became a better team when Mbappe, Neymar and Messi left, when they were at the club, the union never worked and everyone was playing with big egos and not for the team. Right now the coach has more authority over the team and there are no big egos in the team anymore, that is why PSG have worked hard to be the best team in the world.
Sunday's final should be easy for the French champions, i know Chelsea are not so bad, but i don't think they stand any chance against this PSG team, except a miracle of a final happens.
You're right one big mistakes that the PSG management where doing was the idea of bringing big name players to the club with the hope of winning the champions League it never worked because a team is never built with Great players who plays individual football rather than a team work because looking at the Neymar and mpappe era it was charactarized by individuals football not as team work, what is making PSG stand out is the team work that this current coach has instilled in the team.