How else are we going to see a Halfling fight a Hill Giant à la David versus Goliath?
If only halflings still had their 3e bonuses when using slings and against big creatures...
Still, the future's looking a little brighter for strength martials who need something to throw (javelins), non-strength people who also feel like throwing things (darts), and anyone hoping to do crushing damage with their ranged attacks (slings). I guess it's only a matter of waiting to see how it all gets implemented in the (hopefully) near enough future, because the ammunition concern stands regardless. That implementation of the darts in the video seems to work the same way it does in the Pathfinder games - as in, it's a single self-replenishing dart. Streamlined but unfortunate. As that one post above mentioned, collecting rare darts (and rare ammo in general) was a neat mechanic to play with. Like how in Icewind Dale 2 you have missiles of striking that are practically useless against enemies that aren't immune to normal weapons, but suddenly become a powerful tool against high-end golems, powerful fiends, etc.