People said that he was influential in the dressing room as though that must have been a good thing!
It's only 'good' if the influence is positive. It's 'bad' if it's a happy loser mentality with pretences about being a celebrity that can potentially breed a negative culture in the dressing room.
Pogba might have worked out in a stronger squad surrounded by stronger characters. But at United, he was the biggest character in the place. As such set the tone for how everybody else conducted themselves and represented the shirt. If Jose is to be believed (which I'm inclined to do), he was a major source for the problems that have plagued us for so long.
Overall, he was possibly the worst signing in United's history. £89m with no sell on fee, injured for about a third of our games, disinterested for a lot of the rest, unable to function outside of a mythical Goldilocks zone, needed a setup with 4 or 5 players around him dedicated to making him look good, refused to play with any effort in an era of high pressing, repeatedly disrespected the club with thinly veiled hints at wanting to leave, more interested in looking good for youtube compilations rather than winning games, and a damaging trend setter for the club culture.
Wanted him to succeed. Disappointed he failed. Glad he's leaving.