Does anyone else think it's weird that there's a damage keystone in Resolve?

If someone wants more damage, isn't that what Ferocity and Cunning are ostensibly for?

Wouldn't Resolve be a better place for heavy in-combat sustain than Ferocity?

I'm questioning the sense of having two sustain keystones in two separate trees. I'm really questioning the sense of having the hybrid sustain/damage one in Resolve.