Yeah, the whole "humanocentric" thing depends a lot on group. I know that even way, way back in the 80's when we first started playing, I was about the only player who routinely picked human. Elves were extremely common IME. But, after a couple of years, we started seeing a lot more variety too. Minotaurs, Half-ogres, and various other things. Looking back at it, my groups were rarely, if ever, majority human.
But, the game that was published, particularly the settings, went the other way. Every town was 99% human (assuming it wasn't "elf town" or "dwarf town".) It was always really weird for me.
I think one of the biggest changes in D&D was the shift from AD&D to 3e where the developers actually started talking to players to find out how people were playing instead of sort of dictating from the mountain on how the game should be played. TSR, AFAIK, never did any market research at all. From what Ryan Dancey and others have said, TSR had pretty much zero idea of how the game was actually being played in the wild.
WotC changed all that. They might not get it right. But, no one can say that they aren't trying to look at how the game is being played in order to guide what they develop.