AND the proficiency for it is not in the EA either...
It gets even worse ... proficiency was in EA ...
But was removed in later patches, i believe it was either in Barbarian or maybe Sorcerer patch.
But im absolutely certain that my Druid had it!
Really! I recall they had the hand Xbow, and then they didn't and then they did. I totally missed the sling proficiency. Good catch.
I mean, if I were to bet I think we will have Slings, and a few other weapon types not in game. I think Larian is going for total shock on release, even for us old coots who have played too many hours (1,900 and counting)