Why Has Riven Not Been Nerfed Yet?

With her seeing large amounts of play over in Korea and China and the large amounts of complaints people have had with her even when not played competitive isn't it time she was finally actually nerfed and given some dam counter-play?

I don't know who's idea it was to give a manaless champion low cooldowns, masisve damage, stun, shield, damage steroid, ranged AOE execute, wall hop, 4 dashes, etc all this in one kit and has stupid cooldowns, and there is honestly no counter-play to her kit.

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Other manaless champions normally have a massive downside to them, weather this be Garen's kiteability or high cooldowns, to Mordekaiser's lack of any mobility, they all have some sort of weakness that they are given due to them being able to freely cast abilities, but with Riven there is none that i can clearly think of? What she's melee? that doesn't really count at all.

Add to this she never really has a weak point at any point in the game, champions like poppy etc are know to have powerful late games but in return have a weak early game or vice versa, with champions having strong early games but weak late games.

But with Riven can you honestly ever say she has a super weak point? only thing i could ever think of is if early game vs a ranged champion but even then she would do better than some such as Garen, etc that have no way to do anything to a ranged top laner.

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Riven could really use with a rework or major tuning cause at the moment its not fun to have a champion that can dash almost constantly and then insta kill you with no clear counter-play or weakness, and really needs to be tuned and weakened or opened up to counter-play with which to go against her with.