I doubt that we wound up with our current firmware + hardware at 300k years ago because we reached some kind of global optimum. It's possible that at that point the hardware was just good enough to run the software that was able to eliminate all competitors.
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Most of the hominids that were around 70000 years ago don't have living offspring. The domesticating adaptations that define the success of our species likely appeared much later.
End of conversation
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