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One of the problems PSG had with stars like Mbappe and Neymar is that they felt somewhat bigger than the manager and they put their egos ahead of the team. That said, when you watch PSG play now, what you see is a team and not individual egos, and it turns out it was a good decision that Mbappe, Neymar and Messi left and the hierarchy at the club changed their transfer policy to homegrown players, they are doing better now and they will achieve more success going forward.
You are right. Mbappe was a bit stubborn. He tried to adapt to Messi and Neymar. And at PSG we saw that Mbappe's main target was to score goals. He had no mentality to help Messi and Neymar. And this is one of the reasons why PSG's inconsistent performance despite having a strong squad.
But it is also true that an experienced coach can change the whole scenario. With a coach like Luis Enrique, maybe the bonding between Messi, Neymar and Mbappe would have been stronger. And PSG's attack would have become unstoppable.
Sometimes having several star players in one team will create a lot of gaps, making it very difficult for every manager to manage their egos in the dressing room. The history of Los Galacticos that was once built by Real Madrid should be a lesson for any team that aspires to build a star studded squad, that the ideal squad does not guarantee success every season.
PSG without Mbappe, Neymar and Messi looks more collective, Luis Enrique task looks easier to encourage each player to find their best performance. Kvaratskhelia and Dembele have succeeded in doing the job left by Mbappe well, and I see almost every PSG player now has the potential to score goals.