Dawn of Everything is a textbook example of cherry-picking data to support a preconceived ideology. It's not good science.

Graeber was a smart guy, but also had a pretty clear, and strong ideological position regarding power structures.

Hierarchy is natural because of natural limitations like "Dunbar's Number". The human brain can effectively track only so many relationships, and at some scale it is advantageous to consolidate them into abstractions like "authority" or "organization".