You are saying that too much pressure and big hopes can stop team from doing well and you are using Real Madrid and PSG as examples and when team gets much of famous players and it looks exciting at first but with this team not work well together and not win trophies.
Real Madrid are making same mistake with having too many attacking players. This could mess up how team plays together. They need to sell some players to make team more balanced.
It is true that when they have many famous players and it is hard to handle their personalities and what news says about them. It is more important for team to have players who work well together than just having much of star players.