This is the thing while they can be considered as a good player for mid teams, they need to be constantly showing a sense of positive growth for then to be in a top team and maybe won't even still be as an active starter of that team.
But Manchester United team continues to highly praised them and sometimes even acts as if they are world class, consistency matters and while Nicolas Jackson who is even having a better season than Hojlund is sometimes seen as not really reliable by we fans and we are still hoping to get a better nine for starter since even Nkunku has not really do well to replace him as starter for Chelsea.
I as much as I will agree with you that most Manchester United players are not suitable for the team I wouldn’t call them below average but rather leave them as an average player rather, In terms of individual quality I think Hojlund has them but has he shown that to Manchester United I would say No, can he strive in other clubs I will say most definitely but he is just not the kind of player Manchester United can call their point man, same with the likes of Zirkzee.
Sancho who hasn’t been starting all games for Chelsea couldn’t get into the Manchester United team and he plays better for the Chelsea side because the pattern suits him. For me I think Manchester United needs to back this Amorim and let him build his team and then offload most of these players. But one thing this club is known for his hanging on way too long for my liking.