You can still ride track on an old mountain bike. The specific technologies listed have all been part of the changes for road bikes as well (disc brakes, better derailleurs, tubeless tires, suspension (mountain) and frame materials (carbon for road bikes)). And in both cases the outcome is the same - better performance at the cost of more expensive purchase and maintenance.
And the snobbery from "elites" who think they own the road or trail are damn similar, and the same across other sports I've done (skiing, snowboarding, surfing, sailing...) too. All I'm saying is that the peak performance isn't really relevant to having a good time, and other considerations may be different for different users.
Edit: in good faith I'd guess your argument may come more from a competitive view of mountain biking? Even if competing with friends via strava segments etc?