That's not really true.
If you watch back games under SAF, the one thing that always stands out to me is how every player is comfortable playing 1, 2 & 3 touch football. He didn't keep players who couldn't do the basics to a high standard consistently.
This Utd squad is just littered with players who just can't do the simple things consistently to a high standard. Every player can control and pass a ball, but it's down to bad habits and them getting away with it for too long. First touch is the wrong way, loose first time passes, poorly weighted passing, over hit crosses, passes behind players, too many touches etc.
As a group they just seem to accept this stuff, that's why I was happy to see Ruben say he was ok with the players arguing over passes after the game.