So confused on why Yasuo's windwall is so large

I've never even had much of an issue with this champion but now I really do wonder:

• Why does such a gamechanging ability get to be so large and not an ultimate?

It's half the width of lane or more and can block off and entire section of the jungle. Your team has to wait as your teammate dies since you can't sacrifice your position when they engage to do damage to Yasuo as it's easy to just shred your team here. The double-digit CD isn't much when it can last an entire teamfight. In addition, say if you did finish a teamfight - Yasuo has all his abilities up in 30 seconds and can just stop you from defending objectives with his windwall again.

For so much of his kit having safety nets, I believe his windwall does not deserve such a large width late-game. His W is meant to be a reaction-speed based defense ability to stop projectiles but it's the equivalent of an ultimate-ability to how game-changing it is considering he can also dodge CC with his E.