What if? Yasuo
I know everyone (or a lot of people) hate Yasuo's double crit "mechanic". What if, we removed it, gave him back his critical damage, and removed the cdr from attack speed cap on his Q. That way, a good yasuo would deal as much, or more damage, but would have to constantly be hitting his Q.
If that would be too weak, then they could just return the shield passive to its previous duration, or even return the % flow recharge. Because let's be honest, double crit is not nearly as interesting as Riot thought it would be.