Ask yourself this, why are his managers not playing him in his favorite position for both club and country?
Aside from the fact Deschamps is a moron, even a competent manager would struggle to build that french side around Pogba because Griezmann plays as a second striker, and they have an abundance of riches in attacking positions which means in order to shoehorn Pogba into the side, due to him obviously not being as big a threat in front of goal compared to second strikers/wing forwards and CF's.. the seemingly logical solution for Deschamps seems to, play him as a CM.. at cost to the overall balance to the side and as we saw in the Euro 16 final, their fluidity.
What Deschamps needs to do is either use Griezmann as a false 9, or go diamond.. or just bench Pogba. The worst thing he can do is just shoehorn him in just based on his reputation and status.
Diarra
Rabiot Pogba
Dembele Griezmann Mbappe
Probably the only way to get Griezmann and Pogba into the same side and not lose width.
With Mourinho, he has long been wedded to the 4-2-3-1 formation and because Pogba is obviously not a 10, he has to therefore operate as a CM. When he has gone 4-3-3, Pogba's lack of attacking output compared to say a Lampard/Gerrard means that with the lack of killers in the forward position, Jose has not wanted to gamble on letting him grow there as it might risk not being able to score enough to win games and get points on the board. For Jose, it is a results first policy over the cohesion and performance aspect.
Which is understandable in the short term, but when the performances are getting that bad to the point where the results are no longer trickling in and the superstar you have been playing out of position has had enough, you've got to try something different.
Bottom line is both France and United, if they were thriving inspite of Pogba being played out of position, then I would understand and be behind both managers as the team comes first. But when the overall fluency of both sides is not great, and Pogba is at the heart of the issue.. then either bench him, or change the system up to better incorporate what he wants, as he is likely to prove a key component in getting the team to be more fluent in attack if unleashed and given time to continue to grow in that role.
The way I see it is, as a left sided AM, he can grow into a 9/10 player.. yes he'll have bad games, but he can be a star if backed. But as a CM, I can't even see him making par - he's going to be struggling massively to even be reliable in that role against competent opponents let alone a world class star. So if you don't trust him, you don't want to develop him.. stop playing him and go buy someone you believe in, but don't waste his talent.
In hindsight, would I have brought Pogba.. no. Very difficult player to build a side around, and not the sort of player you buy when a side is in transition. Secondly is he guaranteed to be a massive hit in a three and viola we are EPL winners, again no.. he could still flop and not hit the expectations we need. However, tactically speaking is he definitely better off going more forwards than he is going backwards? 100%. Tactically he is unbalanced and not as good going backwards as he is forward.. for me that is unquestionable.