Was going to start a new run and noticed a small but potentially bummer-y detail: Sorcerers (the latest class to have been added) are missing their Sling and Dart proficiencies they're supposed to have according to the rules, while Druids (added prior) and Wizards (there from the start) have them. The question that arises is: were the proficiencies on the druid and the wizard a placeholder - making it seem like we aren't getting those weapons in the end - or were they just not added to the sorcerer because the game doesn't have those weapons yet?
Honestly, given how magical ammo is implemented in the game (D:OS-style rare arrows that work for both bows and crossbows and are more about utility than extra damage), unless there's going to be a big revamp of the the whole mechanic (separate ammunition types, finite regular ammo) in the future, it's very unlikely that there will be a whole third weapon type for which there needs to be a different kind of missiles (having slings launch arrows will be incredibly dumb). Plus, I don't think there were any datamined models found for either slings or darts, although if Grymforge is anything to go by, there isn't quite everything equipment-related in the files just yet.