How does upheaval actually contribute to DPS

I get that it overrides everything upon proccing on a crit. But why would I want this?

Wouldn’t it interfere with say feral hunger?

It doesn’t interfere with feral hunger, it’s actually the opposite. Upheaval only procs when you crit with a non-wps hit. The more WPS you have, the less you’ll see upheaval.

Interesting. Thanks for the clarification!