In a nutshell, then, there was never a time when humans uniformly lived in small, simple egalitarian hunter-gatherer societies, and a time when they started to switch to agriculture- thus inevitably switching to a sedentary, hierarchical, and more complex life style. This is not because the correct trajectory is a different one, but because there was never a linear trajectory to begin with.
Is there a reason or cognitive bias we've got that would tend to make us think that there's a teleological outcome in these cases?
Why should it seem like there would be a foregone conclusion to all of human life or history? Why couldn't/shouldn't it just keep evolving from its current context to the next