I mean sure, if you ignore all the differences then they look really similar. People dont work like in an RPG, you dont suffer critical existence failure from losing too many hit points. If you die from bleeding out, its because your blood isnt doing the stuff you need it do be doing anymore, not because your body hit the "time to die from blood loss" lever. If youre magically, physics-defyingly immortal, then you dont need blood, but that doesnt mean your body, which you have no control over at that level, doesnt want to keep it there anyway.