It has not a single thing to do with realism.
It makes for boring, samey fights. It takes away real consequences for messing up. Personally, I'd be fine with games that have neither health regen nor health packs. Think of your health as a resource you must manage. Take away that aspect and you take away the thrill in many encounters.
It makes for boring, samey fights. It takes away real consequences for messing up. Personally, I'd be fine with games that have neither health regen nor health packs. Think of your health as a resource you must manage. Take away that aspect and you take away the thrill in many encounters.