Some people won't touch a weapon they haven't enhanced with perks despite the fact zombies are just as dead from bullets that came from an unperked weapon as they are from a perked weapon. It would still be a really fun tool that could allow players to re-organize the perks and attributes but you are correct about calling out the fact that there really is nothing to stop us from using any combinations of weapons that we wish as long as we are willing to shoot, swipe, or thrust those filthy unperked guns, clubs, and spears.