You are putting too much emphasis on the characteristics, technical atributes of players to surround Bruno and you don't put too much thought if Bruno deserves that in terms of HOW you want your team to play.
It's not a question of quality, attitude, Bruno has both in his bag.
It's a question of what style the coach wants United to play if the main idea it's a more press ressistant mid, a less loose and more organized mid (if this is actually the idea many here likes).
The main issue won't be Bruno's technique or quality, yet his personality and tendencies.
Let's say United buys John Doe of 19 years old that looks like Mauro Silva, Redondo, Roy Keane reborn in terms of ability, yet still a kid and so far without those fellas personality, how much do you think things will change?
The minute Bruno decides the pass he received instead of hold in it, of continue to make combinations of short passes it's an instant long ball with no one complaining, nothing changes.
It's not that if he suddenly has a playmaker maestro a la Zico, Maradona beside him, or Kante, Mascherano pac man alike recovering everything, or a big ego nasty mid a la Dunga, Simeone they all instantly will merge and work wonders.
If Bruno still feels he is the boss of everything, including the way the team will play, he'll clash the minute a Gatusso runs like a maniac recovering and he tries three hollywood passes out of nowhere after the Italain left his blood to recovering it.
The other day I've read here that Bruno with Portugal won against a possession style Spain. Yet when watching the game, that Portugal was quite different in approach to what Vitinha and Neves do in PSG and that is because of the coach and the gallons Bruno has in this team that it's diff to Luis Enrique with a very clear idea imposed in his players and later those with the humility to do it as it's told and with solidarity and no huge Ego above anyone. At the same time, Portugal won, so it's question of actually decide if instead of asking stuff Bruno does not have in his blood, to actually play to his strengths, not implying that Portugal in that particualr game won because of him, yet that there are more logical things to ask to Bruno than perhaps him adapting to sthg he doesn't feel nor perhaps in some particular aspects have the quality to do them..
At the end of the day, if Bruno stays, he needs a serious chat with the coach and his mates, there is no kid to buy right now in the market or in the team that can call out Bruno when he goes over the top or to organize/order him a bit. Even Casemiro with his huge shoulders, at this current state, couldn't.
Even if at times it was easy to see his complains. In fact in Madrid, Casemiro was surrounded by two huge players in Kross and Modric, they all interact within each other most of times in a very cohesive way. I don't know if it is out there a player that can do that with Bruno in order to change United style to a more calm, less loose, press ressistant mid. It woudl be hard. Maybe United has to play more to Bruno's strengths, more rock and roll, more box to box, with lots of very atheltic bodies covering the gaps this style always leave. Maybe that is a more easy task to find in the market in order to use Bruno in a more Bruno way, instead of trying to shoehorn in a more possesion and press resistant style surrounded by players that does not have his status in Manchester and his ego. Another matter it's if the majority of fans or not, would want that style more suitable to his tendencies, or if he is worthy of such consideration, that's a question of taste and confidence or lack of it with the player.