EzekielRaiden
Follower of the Way
sighAnd where are they now? Yes, there are a few % of their DNA within the species still in some populations, but...gone. And consider the tech level, the population level, of those earlier hominid's. Their ability to project power, to grow their populations, to wage war.
Now, instead, imagine its pseudo-medieval, and we have magic, and opposing gods. Look at the sad history of our world, and the various cultures within, when there is a power disparity.
In actual human history, yes, when the triumph our our species ancestors was to be slightly beyond the reach of the beasts of the world, separate groups may or may not have lived near eachother, and may or may not, have wiped eachother out.
Not exactly comparable to the various races of our Fantasy worlds, to me.
Yes, they went extinct. But they did so after, again, tens of thousands of years of living alongside us. Tens of thousands of years WITHOUT horrible awful genocide and destruction are possible--alongside apparent genetic intermixing. So these populations interacted, likely interbred, and didn't actively destroy each other. (It's generally thought that Neanderthal more went extinct due to being overly dependent on environmental conditions that became less common over time, which, again, not something that occurs in D&D-type settings, where elves can rule over a single forest for thousands of years and nothing really changes.)
Now let's think about a world where races really are, explicitly, spontaneously created out of nothing, and directly given appropriate environments in which to thrive, by physically-manifesting deities who directly look out for their created children. Suddenly, the possibility of numerous different races becomes a lot more plausible because, y'know, they get support from supernatural entities. Too many wars or genocides? Welp, time to spontaneously make a few more people. Environment becoming a problem? Give 'em a quest to find a new home (hey, the Aztecs did it IRL, why not a fantasy race or three.)
You and others are all but explicitly going for "there's no way this could POSSIBLY happen for more than a tiny short while." Except that, no, we literally have evidence of it happening for ten thousand years, twenty thousand, perhaps far more, without ANY supernatural or divine interference. Again, now, imagine what this would be like with supernatural assistance.
It is not anywhere close to a foregone conclusion that multiple sapient races coexisting together would eventually result in one destroying the other or one going extinct. Further, we are talking about a world where magic, spontaneous generation, and divine intervention are regular occurrences, and where "evolution" as we usually understand it is either slow, rare, or non-existent. Many analogies based off of Earth's biosphere are going to straight-up fail because that's just not how fantasy universes work.
(Also, for reference, if we ignore reprints and stick to just the baseline, not the 17 variants of elves and 9 variants of halflings etc., there are 54 total races available in 5e. And this is counting all the obscure stuff, the giff, the kuo-toa, the bullywug, the hexblood, the plasmoid, everything. Genuinely not sure where the 68 number is coming from, because there's a lot more than 14 total variants between human, elf, dwarf, and halfling, and that's not counting stuff like the variant origin half-elves and the Dragonmarked options.)