I appreciate the form of your comment: A factual claim followed by a statement of uncertainty. My argument is that the comment to which I was responding was a

I appreciate the form of your comment: A factual claim followed by a statement of uncertainty. My argument is that the comment to which I was responding was a non sequitur premised on a number of unstated assumptions. I threw in a few examples to invite the reader to think laterally, to investigate. You question my argument, so I wonder: Have you done so? Have you put the thought in to examine the claim made, and to see what other assumptions are being hidden? Regarding the facts you emphasize, I don't agree that "only" is a good modifier to place before "100-200 years" in this context. The 2000-4000 years you mention is entirely irrelevant, given survivorship bias.