*in your opinion.
I think you left that part out.
What makes D&D to different people is different. There's nothing wrong with that. I don't care if you use D&D to play high-fantasy pseudo-steampunk victorian cyber-apocalypse games of if you like to grind through the mud in low-fantasy, low-tech, primitive settings.
Either D&D is something specific, which I doubt anyone could ever agree on what that is, or it is something general. How general that may be is up to the people playing, but hey if they're having fun playing that thing that doesn't even remotely resemble D&D to you, well who care really?