Blowguns. What’s the point?

I know the basic advantage to blowguns is that you can’t accidentally poison yourself when applying poison to the darts, but is that really it? I feel like delivering the poison via d8 crossbow with a 5% chance to poison yourself would be better than a d2 blowgun with a 0% chance of poisoning yourself. Unless the flavor text “They are nearly silent when fired” is implying that it would be harder for your target or anyone who didn’t see the dart to locate you. Oh i should also mention CRB only.