You might be right about most of TSR-era D&D, except of course all the mass combat rules, minis wargames, stacks of dedicated monster books, monsters in most of the other books, all the modules with even more monsters...I mean, hell...even the gods in TSR-era D&D have AC, hit points, and damage. It's a totally normal thing to give your gods hit points. Makes perfect sense. Nope, not because they're designed to be fought. Couldn't be that. Definitely not a combat game.
Even if we ignored all that (which is silly to ignore), you're still dead wrong about WotC-era D&D.