Come on tell me, what's the biggest problem with Yasuo?

It's his infinite spamming of his E and Q. The latter scales with AS later in the game.

Now imagine Yasuo's E taking up mana; how much thinking process must it involve for a Yasuo player to spam E and also give good counter to his enemies. That way you can even justify his passive shield as well as he would have to use mana to obtain it through E. Now imagine Karthus and Anivia without mana. How retarded would that be?

Since he is riot's utmost favourite champ you can even buff him in compensation of this nerf, but for the love of God, please give him mana so this cancar of a champ realizes how hard mana management can be (most of the opposition considering it but null).