800 damage Q balanced at 20 minutes?

Please explain who thought it was a good idea for Yasuo' Q to do 800 damage by 20 minutes on a 2 second cooldown? He can be 0/9 and just 1v5 because his Q does more damage in a fight than his ult and autos combined. If you really think it being short-ranged is a good enough balance tool to him, you are mistaken. Riot please.