One of the factors that affect most team or rather club is having excessive star players because most people feel that having all the strong players in one team could boost there performance but on the contrary it doesn't work that way instead it will reduce their performance because nobody will listen to each other.
So however when PSG bought so many stars like Lionel Messi, Mbappe, Neymar, sagio Ramos and so many other good quality players with the belief that they would outperform other clubs but on the contrary they were finding it difficult to perform or wining most of there matches, and even some smaller clubs use to win them, so perhaps with that squad they have losing matches shouldn't have be an option for them, but however since some of there players like Lionel Messi and some other left, PSG was able to breathe and they are playing well more than before.
Learning from PSG when signing many top players they can't manage well with some of star player not playing as working team but more ego of them, PSG' manager when have many top players Christophe Galtier faced difficult how to make their teams playing well as one unity team regarding many of the show their individual skill only. PSG can't win UEFA Champion League tittle although have signed Lionel Messi and there are most danger attacking line such as Neymar and Mbappe.
Yes, PSG had too many stars in their previous tournament, and there were many internal problems, leading to a lack of team unity in the match. I feel like they are playing for money. Their morale seemed to be at zero. Coach Galtier was unable to solve this problem. To put it bluntly, he did not have the talent to lead big teams. We should know that the egos of superstars are enormous, and managing them is a complex problem.
Difference with Manchester City dominance by many top players but Pep Guardiola can manage well with team working and many of them not ego for priority their team mates who has bigger chance for scoring goals. In this season, PSG have secure six points left two matches if want qualify to next round and Luis Henrique have to motivate his player how most important on Champion League matches left if want get one position in 16 round.
We cannot compare it with Pep Guardiola. He is a football genius. After a long journey of pursuing glory, Man City has become the Champions League champion. Also, during this time, Pep Guardiola constantly had to fight with doubts and judgments, saying that he could never win the European championship without the help of the genius Lionel Messi. But with a group of young players, he built a powerful Man City empire, completing the excellent treble. PSG's new coach, Luis Enrique, is doing his role well. The team is gradually entering stability. But if they reach the round of 16, the possibility of being eliminated early is possible because they do not have enough strength to dream of winning the championship trophy this season.