If that's the problem, why did they have difficulty bringing the Champions League trophy to PSG when there were three star players at PSG in the previous season? Football does not rely on one person, but teamwork is much more needed and the performance of the coach is one of the important factors for success in any competition. So I agree with you that blaming one player is not enough of a reason for PSG to fail in the Champions League because there are indeed many other things that are quite crucial.
I hope Luis Enrique is given the ease of recruiting players as he wants so that he can work well together in integrating the team's strengths. If you look at his abilities, maybe Luis Enrique is the right coach for PSG, it just takes time for him to bring success in the Champions League.
Having star players can't guarantee with one team easily for winning Champion League trophy such as face by PSG how difficulty become the winner although has most danger trio attacking line Messi, Neymar and Mbappe. Most of them have each ego and make manager difficult for playing as one team until PSG failure on 16 of round in Champion League, but interested with PSG achievement after leaving by Neymar and Lionel Messi success qualified until semifinal round in this season but defeated by Dortmund.
I see has any bigger potential for PSG get better performance next season after leaving by Mbappe and Luis Henrique get easily manage team without any players has ego. Since leaving by messi and Neymar PSG success qualified until semifinal round in champion league will possibility after leaving by Mbappe lead to final round?
I think having superstar players can't guarantee anything but also having these superstar players can make any team to have much more chance in the tournaments. In fact, the best they can do is to have a more balanced team instead of having more superstar players which can be more helpful. This means if you have superstar players you should have a superstar coach to guide them, player, otherwise we will see another failure like we saw in the last season with PSG when they had Messi and Neymar in the team but they couldn't get good results and this means spersing money won't solve everything for PSG.