Nah I disagree. In almost every big game (Chelsea, Arsenal, Liverpool) Pep will put a player with ball control out on the wing. It's because when they press we have someone who can keep possession. When we switch the play and the player on the wing will be able to pick out and control passes that are pinged to them and link the play with the midfielders or striker. (This is why Mahrez was bought IMO.) Sane does not do this particularly well. We can't put Dave on the wing and Gundogan wasn't great doing that either against Liverpool last year. Bernardo is doing what Mahrez should be, but better. He's an amazing player and equally good in both positions. We shouldn't be pigeon holing him into one.