If my experience with archery in
Oblivion is anything to go by, they left out the ability to craft arrows so that in order to stay stocked on high-end ones you'd have to actually go out and collect them off the bodies of NPC Archers. This conveniently ignores the fact that you have to expend arrows to do so, which can result in you having even fewer than you started with instead of more.
I know I'll be modding in the ability to craft arrows, but I would prefer if Bethesda did it as part of a patch or DLC since those on console systems don't have that option.