I’d say if you can reliably hit the (kill zone) area of the animal you plan to harvest reliably at varying distances, you should be okay. I’d also be sure to use darts designed for hunting, like broad-heads or something similar.
I don't feel the same way as you. BOTH can and will penetrate the skin. BOTH requite proper shot placement. You can shoot Darts from BOTH.With a decent dart I think blowguns are slightly more lethal than a slingshot. People have killed bears with them. However I'd say the accuracy requirements would be similar to a slingshot.