Pouring on the realism would completely flatten some of the most popular games on the market. Platformers like Mario and Crash Bandicoot would flop on account of the insane heights they can jump in their games. On the same token, competitive shooters like Call of Duty would be even more difficult to master if non-headshots caused the degree of damage they do in real combat. Not to mention, any game without permadeath already would instantly be turned on its head.