That doesn't pass the sniff test for me. The smallest possible human "community" would be a single family, and families are definitely coercive and hierarchical.

Parenting doesn't have to be hierarchical. Giving support doesn't constitute hierarchy is the sense that anarchists use the term.

In a single family, you have parents and toddlers. Coercion and hierarchy are there for education.

What we are talking here is a community of adult people.

Children becoming fully independent from the authority of their parents and relatives at a certain age is a uniquely modern, American idea. Everywhere else, and throughout the rest of human history, hierarchies of age and blood relation tend to be immutable and pervasive.

This civilization meant exploitation of peasants, genocide of Native Americans, slavery, exploitation of women. It created a lot of wars and suffering. I treat anarchism as a direction to try to get nice parts of current world (scientific research, some technologies like advanced medicine) without the inequalities and suffering that was done along the way. Anarchists postulate structures, a lot of them postulate replacing current structures with federated decentralized structures utilizing various horizontal ways of making decision with the possibility to delegate someone to a task where they have certain autonomy and they can get instantly recalled if for some reason they are not adequate to the task.

Don’t kid yourself. Native Americans were just like any other peoples and warred against each other, took slaves or simply put the losers under the sword. People in any system are still people with the same tendencies. Culture can influence people up to a point. Even in strict places where you get killed for certain peccadillos people who enforce those mores are known to engage in those same peccadillos.

People might think the British were not brutal with their own people, but if you read up on the Clearances, you’d know they valued people less than sheep.

> I treat anarchism as a direction to try to get nice parts of current world (scientific research, some technologies like advanced medicine) without ...

Don't fool yourself! The niceties of modern times require a critic mass that is orders of magnitude larger than what anarchism can cope with.

Anarchists can federate so scaling is not a problem.