Anarchism leaves no openings.
The way I see it, anarchism leaves nothing but openings. Your egalitarian paradise only needs one family to want to seize power gather weapons and find like minded people to form a feudal military organization and they can start picking off and dominating families one by one. Individuals would not be able to stand against this centralized power and the time it would take to meet, agree, and mobilize a militia wouldn’t help.
It isn’t that anarchism evolves into feudalism, it’s that it takes centralized power to resist centralized power. And as soon as you start concentrating power, having a standing army with wages, or other centralized systems to pool community resources, that’s government. Even, yes, a descentralized non-capitalist deregulated egalitarian democracy.
It doesn’t bother me that people want this kind of system, it bothers me that people want to call this simplified form of community governance “anarchy” which is by definition “the organization of society on the basis of voluntary cooperation, without political institutions or hierarchical government” because as soon as you start imposing rules like “we can expell a murderer if everyone else votes to” it becomes a simple form of communal government and the definition no longer applies.