@Balance Team: Yasuo is already too good against mages; no need to buff him
http://www.surrenderat20.net/2017/08/811-pbe-update.html
So Riot decided they want to shift Yasuo from Top Lane to mid, where they think he is more healthy. This is fine and could be addressed whenever he gets his kit rework. however, as you can see above, Riot is trying to mess with Yasuo's MR to make him specialized against mages. Thing is, Yasuo's current kit is already incredibly good against most AP mid laners (just check the win rates), he doesn't need to be buffed to play against mages, what he needs is a kit rework so people don't perma ban him.
This is a case of "it is broken so we are giving it something else to be fixed instead of actually fixing what is broken on the champ (i:e make his top lane performance worst if that is the problem, instead of just buffing what he is already really good at). Yasuo mid loses late game because of team comps, not because of his laning phase against mages which is ridiculous