Why does Yasyo's windwall block falling daggers?

This is something that kinda bugs me, is that Yasuo can windwall Kat's w, or her q while it's landing. The aren't really projectiles, like other abilities, at that point, but the windwall still treats them as one. Like, I had a game where a dagger was just about to hit the ground from my q, and the windwall just barely moved over part of the landing area, but I had already jumped thinking it would land, but it got destroyed by the windwall. I'm not really asking for it to change, just more of a "why does it work that way?" Yes, they still move through the air, but only up and down
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