To some extent managing Pogba is like managing Gerrard.
On the face of it Pogba and Gerrard are like chalk and cheese, Pogba is all silk and smoothness, Gerrard blood and thunder. However, they are both centre midfielders who are not really centre midfielders.
I remember Benitez playing Gerrard on the wing and then putting Xabi Alonso and Mascherano behind him, because he did not trust Gerrard positionally in a midfield two. England managers did the same thing. It was, on the face of it, a weird one. Gerrard's long passing, his goal threat arriving late from midfield, his commitment and work rate should have made him a brilliant box-to-box midfielder . However, Gerrard's positional sense and his tendency to go chasing the game would often leave huge gaps in midfield...
...reminding you of Pogba yet?
Pogba is a brilliant player. He is strong, he works hard (don't believe me check his ball recovery and duel stats), he passes the ball beautifully, he can hit a shot from distance as good as anyone. Yet his sense for playing in the centre of midfield lacks something, just like Gerrard. If anything the issue is that both want to do too much. They want to join the attack, they want to drive the team forward, they want to chase down (how many times has Pogba shown himself to be a defensive liability running down a blind alley and giving away a penalty).
Ultimately you have to either compensate for that in Pogba, like Benitez did for Gerrard with Xabi and Mascherano, you have to be so dominant that it really doesn't matter what flaws exist in Pogba's game, or you have to decide to move him on.
Taking all the emotion out of it: 'He's not good enough!' 'He's Jogba' 'His agent is a $h!t' Man Utd's issue with Pogba has been, and will always be, systemic. We bought Pogba without a clear idea of what we wanted to use him for besides marketing. We have subsequently tried to shoehorn him into a range of tactical set ups and bought a number of other players that just don't work with him.
Its not an excuse. Its just a clear eyed, unemotional look at where things are.