Mbappe is PSG's burden. It is true that he is a player who has extraordinary talent, but the issues he has developed since the start of this season will have an impact on all players. I agree with you, PSG is too busy with the Mbappe problem so their basic goals are forgotten, I'm sure that when Mbappe leaves PSG will play better and more solidly, the coach will find it easier to implement strategies.
PSG's current situation is not because they are burdened by Mbappe's future, which in my opinion has no influence on the team's main target in every match.
Mbappe is an important player in the PSG squad and Mbappe is the main target player for other big clubs because of his abilities. In the match against Clermont Foot, Mbappe got good marks. I suspect the draw against a weak Clermont Foot team was part of Luis Enrique's plan to prepare his team to focus on facing Newcastle in the Champions League.
If I consider PSG's performance when with Mbappe and without Mbappe, at least PSG got better with Mbappe. Therefore, PSG still really needs Mbappe because Mbappe is also still very productive because Mbappe is still young and also has great potential. So yes, if for example Mbappe is really a burden for his problems, then of course PSG will be ready to sell him, but that is not the case. Anyway, PSG really still needs Mbappe and even though Mbappe will leave, but I'm sure PSG will still try to keep him, because Mbappe is really important to improve PSG's performance and quality.