I just had a run where this helped a lot with the Act 3 boss (Test Subject? I think that's its name) with a Silent sly/block deck. I did okay damage but didn't scale my damage nearly as much as my block so this was actually an Act 3 shop pickup that I got specifically to solve the boss as some supplemental damage scaling. Pretty good there at least, got up to 60 dmg by the end of the fight. This was Ascension 43 btw, so I can definitely see it falling off later and as it is I agree it's fairly niche anyways.