It's always been the compromise with Mo. He has the class to affect the attacking play in the decisive moments better than any other player in the team, but he isn't a pressing, tough-tackling monster off the ball. That's always been the case, always will be, and the difference between winning and losing is often about how you make those compromises and accommodate them.
The big difference so far this season, as others have commented above, is that he isn't getting as much of the ball. He's holding his position out right while the play is graduating more to the left, perhaps because the team is trying to bring Wirtz into play more until he pops his cherry.
Mo either needs to (be instructed to) tuck inside a bit more so he can get more of the ball (but then his options and angles will be more limited), or else we need to go back to switching play more and giving him more of the ball (for which we need Mac back in the side, and an acceptance that if the opposing left back is wise to it then it'll be hit and miss, but the hit might just win us the game).
So yeah, I agree with the criticism that he is (more of) a passenger at the moment, but that's the nature of his game, so we either accommodate him more or give his minutes to someone who will get stuck in more - which probably means Jones plays, even when Mac is fit, and I'm sure everyone can get behind that.
