The most convincing depiction of anarchy I have seen is Ursula K. LeGuin's The Dispossessed, where they have deep social conventions that make claiming any kind of power over others taboo. But that never seemed to me a sufficient safeguard against power-hungry people finding ways around it - let along external enemies.

If I understand it correctly, The Dawn of Everything argues that (many) Native American societies had those kinds of strong taboos and that was a workable model until acted upon by an outside force.

I loved the Dispossessed. I agree with the critique that her portrayal of anarchy is a bit utopian and glosses over what happens with unscrupulous actors. But, I appreciate that her point was about the problems that can exist even in the breast case scenario