-_- its not just done for realism. Its to make the game better once it is fully implemented. You don’t like when quirky experimental things happen don’t play experimental. It has already been fixed for the most part to, from here the guns only get better due to being able to haul multiple time saving reload clips around.
Only a survivor can stay up for months on end with only energy drinks, caffeine, and other stimulants, and some vitamins with no ill effects.