I don't agree that Xhaka falls into that category given that he's a player that is statistically dispossessed less than once every other game and has pretty much a 90% pass completion, even at Champions League level, and had the most number of passes in the Premier League last season and the most in the Bundesliga the season before that (and the most in the group stages of last year's Euros). He can look awkward at times, I agree, but he sees a lot of the ball and gives it away very little - so there's no basis for the criticism of him in that regard.
Chamberlain I hope will be helped by the extra time and space he's afforded playing deeper and in a less congested area out wide at wingback. We certainly saw evidence of that in the games he played there - his touch and passing actually became a real plus in our build-up play because it was a couple of levels up from what Bellerin had previously given us playing as a rightback.
If we were to have two proper out balls in Chamberlain and Lemar, for example, it would give Xhaka, Ramsey and the other centre midfielders more capable players to pass to in the face of an onslaught of aggressive pressing. I also think it will make a massive difference having both Sanchez and Özil in those areas where their close control can not just help us keep the ball but by evading it create space and openings. Sanchez gives it away a lot but it's usually because he looks for the incisive pass very often, even if it's not really on, not because he lacks the close control when pressed.