[Harmless Teddy Bear]

They are aware that when you have H/G and a farming group that they trade? Quite a lot.

The Hunter Gatherers exchange meat and hides for grain and cloth.

There is quite a bit of intermarriage as well.

They do know how communities work?

[TigersEye]

I am surprised that archaeologists were surprised at finding Mesolithic-like cultures 7,400 years ago.

Today you can still find some in various places around the world.
The Amazon, Borneo, Siberia and a few places still in Africa.