What's the point of Vi's Denting Blows?

I mean I get it that it's a close copy of Vanye's W, but what's it doing on Vi?

Here's why I ask: Vi isn't really played as an AA based champ. This is an AA skill. Everyone plays her more for her burst damage, as in builds than anything else. I never see people build something like bork on her to get as many AAs in as possible, maybe grab a LW to just chew through tanks as a linebacker. I never see her opting for a power farming devourer build, she'll usually go warrior, occasionally go Juggernaut.

There's also the problem of staying alive. Vanye's W barely works because she's got some distance and can minimize herself to risk. Vi is an all in champ and staying alive long enough to pound on someone for the 6 seconds you need to really get a lot out of this skill is a bit much to ask unless you go full tank. But if you go full tank, your AS is low and you won't have the big AD you need to get a lot out of the skill. Since you can't expect her to stay alive, you need to go burst.

Now her W would be great for all-ins up top or mid. But riot never really committed to making her solo lane viable even if that's how they first envisioned Vi.

So what's going on with this skill?