It's cool that there's loads of ways to get the Use Poison Feat, but unless you take the rogue Poisoner perk, actually sourcing blade Poisons can be a pain. Which means there's a tendency not to use it as you never know when you'll get more.
- The majority of poisonous things I've ran into aren't flagged as harvestable. Most Snakes, for example can be harvested for meat but not poison. Spiders are fairly reliable, but not all of them are flagged. None of the insects on Brood Hive leave a harvestable corpse. There's one quest I mostly do now just because I can load up on high-DC venoms
- I haven't seen any INT, CHA or WIS blade poisons drop, and they don't seem to get given from Poisoner either. Being able to, for example, mess up the Savage Prophets' DC and spells would be cool.