3. Luis Campos doesn't know how to build teams, Christophe Galtier failed at his best trait
All of the above comes from a disastrous season-planning by the duo of Luis Campos (mostly) and Christophe Galtier (also to be blamed).
When Campos took the reins and decided to send the veterans packing in order to rejuvenate the squad, everybody thought that'd be great and that it aligned with Galtier's main skill: a careful and caring and fantastic managing of his teams, making the most of them and bringing the best out of their members.
What an incredible failure it's been. Galtier was never going to manage the über-heliocentric Neymar, Mbappe, and Messi nor bring everybody together. Let alone, obviously, make cohesion pop in a locker room split into two clearly young/old halves featuring your overhead Ekitikes and your world-champions Mbappes.
Remember the Real Madrid of old? The Zidanes y Pavones model? That team was loaded and still only managed to win a Spanish league and one Champions League in seven seasons. That's one more UCL trophy than PSG have won in their QSI tenure but many (many) fewer domestic titles.
Vicente del Bosque, who you can really see as the Spaniard alter-ego to Galtier at PSG, won all of that. Galtier, tasked with a similar job, has definitely not and his time seems to be running out. So much so, that he might not even coach PSG once more.
The Campos-Galtier pairing looked great on paper. Nasser Al-Khelaifi might have now realized that, instead, it was always and realistically going to be something closer to a PSG-Campos-Galtier trio instead, and that was never not going to fail.
Time to work the phones and reach out to Thomas Tuchel and/or Zinedine Zidane. Or just ditch it all out, move to Manchester, invest in United, and leave PSG and their 53-year history to live in peace and by itself.