We are largely, but not completely modern humans. We are hybrids between modern humans and neanderthals. All the human sub/species throughout history existed on

We are largely, but not completely modern humans. We are hybrids between modern humans and neanderthals. All the human sub/species throughout history existed on the werge of extinction, or were at best insignificant from the Nature point of view as a whole. We on the other hand took over the Earth in a few 10000s of years. There seems to be synergy in backmixing of populations that underwent the opposite specialization trajectories, group specialization vs individual skill specialization, where each specialization on its own would have likely death spiralled.