@Riot - Question regarding Tristana rework: Why not make Buster Shot a skill-shot?

Buster Shot, IMO, is too good an ultimate because it's a direct-target nuke with a powerful knockback. Assassins like Katarina, Kassadin, etc., can't outplay the ability because it can't miss a target unless it becomes untargetable (i.e. Fizz, Elise, Vladimir, Zed, Yi).

This makes me wonder why Riot hasn't considered making Tristana's ultimate into a skill-shot with her rework. It'd do two things: First, it'd allow good counterplay from blink-capable opponents, as well as from enemies who can sidestep it in time (like Vayne). Second, because of the new counterplay, it'd be potentially allowed to have more power. Skill-shots tend to be nastier than direct-target nukes.

Any context or discussion you want to contribute, Riot?