Actually the pressure comes from the players themselves, can they deal with the pressure a bit and focus more on playing so that the team performance can be strong.
Harry Maguire is a player with a defensive position he should be able to make Man United have solid strength in defense, but everything you have said is true, that he actually played less than his maximum and made several fatal mistakes.
Maybe Erik ten Hag will put him on the bench more often next season.
In the last season I didn't see Maguire having his best performance but instead the bad things he did several times like carelessness that had happened several times like blunders in his own goal.
from some of the mistakes that occurred it seems that Man United did not really defend Maguire if they wanted to leave MU because I think Erik ten Hag was a bit fed up with Maguire's behavior.
but unfortunately some people still believe that Maguire still has power at Man United but for me not.
Well, some of the mistakes made by Harry Maguire were fatal and made the coach feel disgusted with him.
There are several teams that are still eyeing and wanting Harry Maguire but for some reason a player like him is still being kept by Manchester United until now.
But just like I said before that if he still played for Manchester United maybe he would only be placed on the bench.
I don't really believe that Harry Maguire can still give the best for Manchester United, so it's better to sell him immediately and buy another player who is better for defense to replace Harry Maguire.