Quite a few things:
-playing a pen & paper game is different from playing a role playing pen & paper game.
Role playing is not about rules, mechanics, so called RPG elements, it is about role playing.
ADD or any pen and paper role playing game is no insurance of playing a role playing game.
ADD ruleset can indeed be used to play a skirmish game, with role playing absent from the game. It is all about taking decisions to optimize the efficiency of the character mainly in combat, excluding the role of the said character. It is nothing different from wargaming
The consequence: as players do not role play when they play this way, nobody shall refer to this as a role playing experience, it is munchkin experience.
-Emulation of role playing experience: it is quite hard and developpers are struggling to do this. They still have to consolidates ways to bring role playing to computers.
Current population of so called RPGers is divided in two segments:
-small scale wargamers, skirmishers etc… who want to be given skirmishing gameplay
-narrative game players (skyrim type) who want to be involved in grand stories and want to be able to shape stories as their input go (as this is what you do when you play pen & paper narrative games)
Both segments could stop immediately to call RPG what is not RPG, and start calling their games what they are, skirmish or narrative games. They wont be hurt in the doing. But they wont do it.