It's because all these players are not disciplined enough. I love Onomah but until he learns to tackle, track runners and generally stayed disciplined he won't play in CM at the top level.
Everytime I have seen him for Villa he as looked lazy af in his tracking back. That's probably why he has found himself out of the team of late. He's an immensely talented players but needs to scrub up on some of the fundamentals of midfield play before he can develop any further.
Completely agreed
You cannot jog 2-3 strides away, down a central channel past Dembele, Wanyama, Dier or Winks. You just can't. They'll bust a gut to at least hurry or harry an opponent in that area of the pitch for obvious reasons. But, disappountingly, the Argies did this to Josh all game this summer. I have no idea how that score ended up 3-0 in our favour.
My biggest worry for him is his energy levels.
In possession though he's clearly quite gifted and his game is still blossoming.