Simple Idea for a Riven nerf.

A lot of people can agree that Riven can be a cancerous at times, and is an extremely frustrating to play against. But all the Riven reworks I see are a little too complicated. Here is a very simple idea, thats very effective. Give her ult a channel time. Have it take 1.5-2 Seconds, for her sword to be normal again. Normally, Riven just ults, and her CC and damage, make it hard to contest her damage, then she just wind slashes when you're low. And know, this wont "kill" Riven. Hint, all you need to do is ult in a brush(what people already do)and after it's done channeling, do your tons of damage.