You increased marksmen AD but not common mid laner armor
While adding in a Rune that gives you a magic shield if you get bursted below 30%. Marksmen like
already perform exceptionally well against mages early game.
I am not optimistic for this preseason.
EDIT: O. All AD champions got their AD increased. Including common mid laners like Zed, Panth, Riven, etc, and every AD jungler. Gonna be a miserable time for AP mid laners.