"In order to make sure Senna can scale without CSing or KSing, and without building marksmen items, we made sure she can scale with her passive"
Me: But what if we just build damage, CS, and KS anyways?
Riot: Umm, don't.
This is just Pyke all over again. People are going to go full damage, she's going to delete people, they're gonna nerf her, then eventually add some restriction to her so she can't build marksmen items.