It's not even that it's an uneven mechanic, it's that ammo management in general is a dumb mechanic in MOST RPGs. There is never a point where you may want to use less arrows to conserve ammo, and it's not like the game provides you with limited ammo like a survival horror or FPS game would.

It's just kind of there for realism/tradition's sake, and to annoy people with inventory management.