at this point you might as well make it work on every negative status instead of just "pretty much all of them"
Probably not all of them. There are way too many different poisons and opening up more interactions with that tree than just possibly spydric if it counts as a pin would probably be too much. Right now, though, it seems designed to be too reliant on throwing knives/precise aim's specific list of conditions inflicted to get much out of it given that it appears on classes that don't have throwing knives.
I haven't played enough 1.5 to know who all it's still available to, but the previous version seemed to be a pretty common locked tree on stamina classes.