Regarding Manchester United, they have been declining for a long time and have changed coaches repeatedly and have not been able to give them anything. In the hands of their new coach at this time, there has been quite good development that they can show, although not that consistent. This will be a very long job for Amorim, because he received the coaching baton when Manchester United was slumping. I myself will not blame him completely if this season he has to fail because after all he handled this from a minus number. Lol
You're right. Man United has changed their coaches several times, but there is no big change in Man United performance. Even the current coach, it is a good coach. But Man United performance is still not really consistent, they often performed very badly. I've no idea about Man United performance, they may need a certain coach with special records. Well, it's true that we can't blame the coaches. We don't know if the problem on the coach. It is possible that the main problem isn't in the quality if the coaches.
If we count the number of coaches who have handled Manchester United after the Alex Ferguson era, there have been at least 8 different people who have come and gone, including interim managers. However, the expected success has not been achieved, even though the management has spent a lot of money to build squad depth in each manager tenure. Ruben Amorim has the potential to lead Manchester United to success, but he must get the same opportunity as the previous manager to build his ideal version of squad depth. Besides, no one knows for sure what caused Manchester United to have difficulty returning to its glory days, overall maybe they just haven't been lucky.