Why does Yas get so much with no real downside?

Any legit answers? he gets free double crit, a huge shield, manaless, low cds, high mobility, high damage, a game changing wind wall, and armor shred. Hell, he had a game changing bug and riot couldn't give two shitz about it until pro play calmed down. people like to give reasons like "he needs the shield and mobility to get into fights" and "he takes skill to use to his full potential" which sound like the horrible comparison of "well, mage X needs mana for spells, so it balances out" or "just use hard, non skillshot, auto hit cc when his wall is down with your whole team there". I know the real reason, he doesn't bother the professional player level and sells skins, but geez can a brotha get some nerf up in here?

[zombie-brand-mindblown] where are you balance team? (don't get me going on those totally needed nunu nerfs on PBE

Edit: totally ready for crying yas fans to vote me back down to the stone-age. your anger only feeds me :3