Emery wasn't afraid to play young players who he thought were consistent in his defence. Guendouzi often played around the same level most of the time, and so does Saka. Had Arteta been in his position in 2018/19, Saka definitely wouldn't have broken through the way he did under Emery because Arteta doesn't want to burden young players with responsibility for them to end up failing or making mistakes that cost the team. Thats the trade off with younger players, and you're either OK with that or you're not. IMO, this isn't applicable to Saliba - a player who actually does have some modicum of top flight experience and a CV that includes very solid games against the better attacking teams in France. I understand Arteta's apprehension but in this case it's misplaced. As much as I can understand that Saliba has undergone some personal trauma, I still think he should have played for us by now.