I also think Ganacho is a good player, but I realize I'm not management or a coach. So I think the Man United coach and management want greater expectations from Garnacho at the moment. But during Amorim's time there that didn't seem to be met. So Amorim is preparing to sell him to get a player they think is better. This seems to be a situation we have to accept, although I think there are many factors in the success of players in the team including the coach himself. So Amorim must indeed be prepared to accept if indeed Garnancho performs better with other clubs.
Maybe Amorim is a good coach and sees how to make Manchester United better, but he is clearly limited in funding for new transfers. And maybe he is also right about the players he wants to sell, otherwise the team would be stronger, but if he came to such a team, he should have assumed that it would be difficult, because when he came here he saw that the club was doing very badly.