I am willing to give Mou the benefit of the doubt IF Pogba was the only players he had issue with. Pogba has never had any issues with Juventus or France. Yet, he's the sort of player you need to build a squad around. So one can understand if managers ends up losing patience with him, although tbf Conte did took the best of the boy and character wise he makes the likes of Mourinho look like cuddly teletubbies.
However these issues aren't reserved to just Pogba. Mou went very hard on Shaw in the past with rumours of him turning Everton down this summer forcing Mou's hand to keep him. The gaffer has also issues with Martial and Woodward. Meanwhile DDG was set to sign a new contract but everything went cold on that side and Sanchez and Rashford's performances had nosedived under him. Out of the 10 signings he already made Mou had burnt bridges with 2 (Mkhitaryan and Pogba) and he seem losing interest in another 2 (Bailly and Lindelof) as he's quite determined to add a new CB to the team. That's 40% of the transfers made. Meanwhile his assistant left him, he had arguments with his former doctor Eva Carniero and his relationship with Emenalo are known to be tense.
We're also talking here about a guy who lost the dressing room at Chelsea and there's every chance he did the same at Real too. So I really wonder if he's mismanaging Pogba and Martial in the same way he did with De Bruyne, Lukaku and Salah. Imagine what sort of team Chelsea would have had with those around.
TBF he seem to have the support of the grafters ie the Valencias, the Lingards, the Fellainis and of course Matic. However, he need to understand that we're Manchester United. Our aim is to seriously compete for the CL not to bully ourselves in remaining in the EPL. So seriously, if he can't handle the talented players anymore then maybe its time for him to move to a club were these sort of players are somehow rare. I suggest Stoke would be the right fit. He might even be able to take his beloved Lindelof and Fellaini with him if he asks nicely.