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That’s just not the case. There are Bedouin communities and tribes of hunter gatherers whose material culture and overall aesthetic would appear (at least to the outside observer) to be more or less the same as millennia ago. That doesn’t make them any less modern than us.

But it’s probably worth pointing out, to both of us, that this is science fiction, so my attempt to apply modern anthropological reasoning is just as flawed as your assumption that things must visibly change over millennia.