Amorim should have understood where he was going, Manchester United was in a bad state even before he was appointed head coach, and after that he sold several more attacking players and what did he expect, that just because he became a coach, the team should win, no, that's not how it works. Apparently, Amorim is not as good a coach as expected, and most likely they will give him more time, Manchester United management has such an approach, they gave time to every coach they had, but as history has shown, it did not help any of them.
Coaching Man United is not easy, just look at how many coaches have been fired by Man United. Because coaching Man United has pressure because this is a big club, big history, the biggest fans in the world. Consciously or unconsciously, the scary job is to be the coach of Man United for now, because failing to coach Man United, a career as a coach will also fade. Amorim took this step of course there has been quite mature consideration, and to judge Amorim's performance is still too early in my opinion. So it is not wrong if the club management gives him a season.
In essence, the key to success in coaching Man United like the Sir Alex era is because he also acts like a club owner. This is as conveyed by Rio Ferdinand on his Youtube channel, he said when he was still a player, if Man United players were on holiday from training, Sir Alex was still present in the work room to control and supervise other departments. Players who performed poorly in the first half were not invited to compromise and were immediately punished in the locker room in the middle of the match, if they were still stubborn they would definitely be sold. Maybe Amorim needs a firm stance to fix the club and of course give him the freedom to buy players. Because believe me, firing the coach is not the solution, management should understand this.