Please for the love of god don't balance Yasuo for <100% crit build RNG
I know a lot of people didn't like how easily he could get 100% crit before, but at least his damage output was consistent instead of random, and he was subsequently balanced around that. Assuming he's in a statistically balanced state he's going to become the lategame equivalent of a level 2/3 Tryndamere all-in, where close lategame duels are decided on a series of dice rolls.