The problem is that PSG always fails to reach the final Champion League even in the last 2 seasons their steps stopped in the last 16 obviously this is not an achievement that can be proud of, so it is normal if PSG is looking for a new manager. When compared to Manchester City clearly the achievements were different because they go to the final 2 times until they finally became champions. Actually when a team like PSG has many star players it will be more difficult to manage it, there are always obstacles related to egoism and other things.
Here most of the time in past few years PSG management try to win Champions League after investing huge funds and having long list of big players now they need to bring changes in their mindset as well because only money can't give them win they also need to have soccer heart as well which will surely helps them for having better results now first time we have too many stars are out of the team new coach is well experienced and understand all conditions which will helps them to win, but main thing is now they need to give him time which is also important this can take two or three years as well because without this it's not possible wins been never came in overnight it's mostly takes time like we have in case of Manchester City hopefully if they will understand this all win will be occurred soon for them in all competitions.