What is the point of Plague Infusion On Melee Weapons?

I mean the point of it is to do more damage, no?
Admittedly I haven’t messed with it yet, still trying to cap off my Icebreaker build and missing a rune but point being is it not functioning as noted in the patch notes?

It’s a payoff condition instead of a just damage, seems like it could be cool to play around.

Figure that’s because of the increased damage done on hits because of the condition or ?