the truth is if a club have too many Star players the team will experience problems no doubt, there will be ups and downs in the team because all there Star players will want to show up there skills and forget they are suppose to play as team. If the star players of a club are now playing for their own interest and not for the interest of team, the manager need to act immediately if not the team will not perform well anymore, Team work is what keep a club going.
That's true, and I'm not surprised a team like PSG couldn't win the Champions League when they still had so many star players, including Messi, Neymar, and Mbappé. But when they were no longer in the team, PSG won the Champions League straight away last season, and that's a pretty good example to illustrate your point. So, star players, whether they're not star players or not, must be able to work together to bring victory to the team, because the team doesn't teach them to play individually, ignoring their teammates.
Star players don't create good energy within the team. Players need to be able to play together in harmony without having huge egos. PSG's squads from previous years were truly legendary, with incredibly good players, but they weren't successful. But as has been said, this year's PSG is playing a completely different kind of football, a joy for everyone who watches it.
I feel like I'm watching Barcelona play years ago. It's like they're playing a computer game