Aurelion Sol Nerf?

Okay I got a serious bone to pick with the nerfs. I think it's bad enough that he is so easly countered by 90% of the champions in the game just from them being able to do easily move in on him, but to nerf the one aspect that makes him unique realllllly is bugging me.

Firstly He's no where as powerful as other mages because he has to go and buy tanker items to avoid being slaughtered so he can't buy pure ap. But he isn't as tanky as tanks because the items he buys only get his deff in the 100's because he still needs ap. The only thing he had going for him were his slows and you nerf them? Are you fucking kidding me? Even with the slows he barely could do much, zed, xin, yasuo, yi, and so many others just destroy him. Not by a little either, but I mean Aurelion Sol could be 25/0 and xin could be 3/25 and he would still destroy Aurelion Sol. Instead of nerfing champions who struggle to do more then be late game team support, why don't you nerf those champions who build just speed items and wreck entire teams. Wtf riot. Wtf.