Katarina: Why?

I'm writing from mobile, so please excuse any typing errors.

I've been looking at the proposed Kat changes, and I overwhelmingly find myself asking, why?

I understand wanting to add complexity to a champion, but I really feel that all that's been accomplished here is to give an incredible amount of counterplay against a champion that already struggled against opponents with half a brain cell.

Any enemy worth their salt will continue to deny Katarina farm early, and now she doesn't even have her Q, since using it to CS will negate such a huge portion of her potential damage, the enemy would simply capitalize on this to press their harass even further.

Having the Q dagger land behind the primary target means that the enemy will simply strafe to one side or the other, and even if they go in to full retreat and you "zone" them for four seconds, upon coming back, they now have a huge potential damage advantage.

I'm curious why anyone would play Kat now as long as Zed is in the game - an assassin who can poke, has an AoE flourish and a pile of "free movement" without even needing a ward, let alone specific positioning of two separate abilities. And who, now, gains a Veigar-like AD buff.