^ But is that at all that much different than the ancient humanoid thing? You still have an entire galaxy of human looking ppl, which is still unrealistic. Having every humanoid in the galaxy basically be a genetically altered human, while more realistic biologically, feels like a much tinier universe than having everyone be actual aliens that had a guided evolution (albeit ridiculous for other reasons).
Trek biology within canon is just terribly nutso right now. I mean, TOS wasn't actually bad for the time period it was done. But it's very clear that Naren Shankar, Andre Bormanis, and whoever else consulted for science in the TNG era just had no friggin idea how biology worked (Braga in particular - Genesis, Threshold, and Distant Origin were all embarassing). This isn't like the warp drives where they needed to invent weird technobabble to explain everything. They could have mined actual known concepts regarding how DNA works, the process of evolution, and paleontology and they just ignored it entirely.