It doesn't matter what the fans think because they're not the ones making the calls and wasting millions left, right and centre. You'd expect, though, that the people responsible for these decisions would dig a bit deeper than: a) he scores and assists goals, b) he suits counter-attacking football, c) he's young and British, so what could go wrong?, before they put a 5-year-long contract worth 350 grand p/w on the table.
You know, simple things like: He's an end-phase attacker. Meaning, he occupies pockets of space between the lines to receive the ball and be the main creator when the plays go down his (strong) right side. He also gets in good positions at the far post to be the recipient of the final switch-ball/cross/cut-back when the play unfolds on the other side. That's where his assists and goals mainly come from. Someone should have raised a hand and dare to utter some questions like: Eh guys... Bruno is the king of the right half-space and he's like a magnet for the ball, so... it might not work? Or we already have Rashford as a final third player to finish chances, so adding another winger who would be absolutely useless in the first 2/3 of the pitch might not be such a good idea?
There's another thing, too. You can call him lazy and perhaps he is just that. But United, in the post-SAF era, have also allowed an idleness of sorts to be established in the dressing room. There have been - and still are - players who either sulk, look disinterest or have a tendency to show a certain displeasure on and off the pitch when they are asked to step out of their comfort zone. If they happen to be fan favourites, they get all the excuses in the world, too. Don't play x player here, don't use y player there, that kind of stuff. Which can breed entitlement and it can certainly slow the growth of a player. Maybe we should look why United turned from a club every young player wanted to play for to a graveyard for good footballers. So, why was he delivering the goods for BvB. Because he was eyeing the big money move and because in Germany, he couldn't point at (some of his) teammates and say: If they are getting to play exactly how and where they want to play, why shouldn't i be the same?