It always amazes me how the conventional (lack of) thinking puts huge gaps between, for example, humans in Australia and humans in the Pacific. Flores Island, 800K years ago, then nothing for 750,000 years, then Australia, then not a move for another 46,000 years, then the Pacific. And for that matter, 7 million years ago near Lake Chad (sez some), no one budges, 6,300,000 years go by, Heidelbergensis in Asia.
I have noticed that as well. What amazes me is that humans supposedly didn't spread out for thousands and thousands of years. I know there are huge mountain ranges and glaciers etc..., but I still find it amazing that the conventional thinking is that they stayed in one place for SO long. You would think curiosity alone would have driven them to explore all parts of the earth, as long as life was sustainable where they went.