Hussar
Legend
There's a very good reason for that.Except that “play XYZ indie game instead of D&D” is frequently given as advice when someone wonders how to add a dynamic to their D&D game.
XYZ game is specifically designed with that dynamic in mind, thus, you aren't fighting the system, constantly, to try to fold, spindle or maul your concept into the D&D framework.
Take a common element in many RPG's -lethal combat. Combat, where, if you start into a fight, it's very, very likely that someone is losing a PC. Something akin to Dread, say. Where dying by zombie is much, MUCH more likely than survival. Or, any game with a death spiral, for that matter.
D&D doesn't work that way. D&D characters are expected to be able to fight, again and again and again. No permanent injury, no realistic combat system at all. So, if you want to play an RPG with a realistic combat system, then, well, D&D is probably not the direction to go. HP and AC don't lend themselves to realistic combat systems. Not that that's a bad thing. But, just that it's a limitation of the system.