Yasuo's Windwall Should Break
after a champion crosses it (it becomes breakable after 1.5 seconds), so it would only be used in a defensive way, as it is already too disrupting.
There is nothing more frustrating than being a ranged champion and having a Yasuo as an enemy, if you go right ahead against him he will punish you with everything, and he will dance on his Windwall, killing you quickly and easily. The worst part was that you didn't even dealt any damage to him, it is even worst when you are 2 or 3 ranged champs and he blocks all your projectiles and efforts.
EDIT: about clarity, the wall is unbreakable for 1.5 seconds, after that it becomes breakable. If an enemy champion or Yasuo crosses the wall it will break. This is not a nerf for his ability to break projectiles if he uses it properly, it is a nerf to his ability (and his team ability) to abuse the wall during a team fight, some times when a TF develops in the jungle it becomes a nightmare to fight against that wall, if you run you will die, if you fight you do nothing -obnoxious-. In the other hand it prevents Yasuo from dancing in his wall ignoring insane amounts of damage (which forces you to run and he will chase you and kill you).
Balance buff??: maybe buff once again his base shield. As I said Riot will never allow a champ like Yasuo to be unviable, but we need more room to counter THAT WALL.
is entirely based on this concept. Learn to attack from another angle to get around his shield.
q breaks the impossible