The prehistoric archeological narratives are certainly conjectural, at best, but we have some evidence to go on, including the lifestyles of contemporary hunter-gatherer groups that are removed from civilization.

The narrative I'm working from here isn't a stretch, though, in that I'm not appealing to much. I'm talking about oral vs written cultures. But certainly, yes, my account here is conjectural and philosophical. I'm not solving a math problem.

Elsewhere, I talk about the importance of stories to any worldview, and I say more about prehistoric societies, drawing on The Dawn of Everything (links below).

https://medium.com/the-apeiron-blog/saturated-in-fiction-consensus-reality-as-a-web-of-stories-485d6e00f7e7?source=friends_link&sk=a398071fd9f19826fcae2157f85d4474

https://theapeiron.co.uk/mass-hallucination-and-the-dream-of-waking-life-a7520e48ca5d?sk=8f1a9f6e56497a7996cf6f3b6724c135

https://medium.com/history-of-yesterday/were-prehistoric-people-childlike-b688bc6dcacd?sk=bfd05b650b87855d6b589dc39e6afb43

https://medium.com/grim-tidings/do-all-cultures-start-from-childish-twaddle-6a7cf341d066?sk=0340a347f82ad7b501edf9d01f37bae6