To do well on a platform like the Champions League, you definitely need an experienced coach. PSG's players were talented but their match strategy was poor. So there was no consistency in PSG's performance last season. If you want to win the title in a competitive place like the Champions League, there must be the consistency of performance. At the same time the help of luck is needed. But what is most needed is good match strategy.
What do you think Paris Saint Germain lacked when they failed in the Champions League? Is their coach a "poor" strategy? Because if you look at the players, it's clear they have a lot of quality players.
In my opinion, Paris Saint Germain failed to build harmony and chemistry between the players. Things like that become a problem, because no matter how good a player is, it will look useless.
nothing less than the squad that PSG have at the moment, maybe the coach was the only reason for their failure in the Champions League but I don't think they should change the coach immediately, giving more time to build a stronger team might be a good solution.
in terms of the players that PSG have, they are strong on all fronts even they have a very good mix of young players and senior players.
PSG is a newly built team and it is unlikely that they will easily win many titles let alone the highest title in the blue continent of the Champions League, not all of that even though they have many star players. but have to build a strong team framework, it may take 3 years or more for them to be able to dominate Europe.