Bering always seemed suspect to me. The cultures get more sophisticated the further away you are from the straits.
I’d suspect landings further south with the northern primitives as refugees from failed societies.
“The cultures get more sophisticated the further away you are from the straits.”
Well, this could be explained, if, primitive tribes accumulated cultural adaptations as they progressed south through a variety of obstacles and challenges. The tribes that were closer to the point of origin would then have had to adapt and evolve less than those who travelled further. Of course, that’s total speculation, but it shows how easy it is to make a hypothesis to fit the conclusion you wish to reach.