You could, with said method, also have a better variety of Monsters/zombies, and you could limit zombie scientists and therelike to a finite amount of manhacks & Acid grenades(acid bottles, still, they throw them nonetheless :P)
For example, police zombies and army zombies could have a variety of armor and/or weaponry on them, whcih would actually protect, and maybe encumber them ; on a similar note, intelligent nether creatures could potentially pick up stuff for further investigating, or they could even try to shoot you with a ranged weapon…or activate a grenade by accident and not throwing it, hehe. would make some sense, right?
EDIT:
Something else - this idea would also mean that arrows and bolts can get STUCK in the player, and they would require some tools (preferably a scalpel or something similar) to get them out - that could be a new kind of special wound you could get on your limbs/torso. It would inflct pain and hurt you when you move a lot/do certain actions (depending on limb.). When you remove the arrow/bolt the wounded limb starts to bleed, which you need to treat afterwards too. This would make bow-wielding npcs quite dangerous.