Manchester United have spent a lot of money in the previous transfer market and almost most of the players they have have not been able to develop well under their coach.
If you say the players are problematic, maybe they will not play well when they are loaned to other clubs and I myself do not know where the problem is.
Amorim is a little more careful in recruiting the players needed and he is not in a hurry to show interest in one of the players who is considered suitable to play with his strategy.
We hope that next season Manchester United's performance can be much better and even though they cannot compete for the title, at least being able to catch the top five is more than enough.
There is no one to blame specifically because it is true as you said there are Manchester United players who have developed when loaned to teams like Antony at Real Betis.
So in my opinion overall the players in the squad did not fit Ten Hag's coaching style at that time so that almost all lines of the team's game were not well organized and indeed if so there is not a single player who should be blamed.
To be able to compete in the top position is very difficult for Manchester United because for next season Manchester United management does not support Amorim with strong finances like when Ten Hag handled last season so that is the problem and in my opinion Manchester United management must be realistic with their targets, if so they should build the Manchester United team with Amorim for the long term and slowly.