Anarchy has this tiny issue where if someone can convince a group of people to work with him, he will likely stand a decent chance of taking over said society. Or the group he tries to take over has to form their own group of strongmen to stop them.
At which point you have the issue of having a group of strongmen in your society. And they might not decide to disband. So you are back to square 1. And well, these strongmen need to kept appeased, so better give them some of the pie. And well, those groups overthere are defenseless against our tested and proven force. Why not take them over for the resources they have.
One way or another, you are stuck with the issue that the moment a strong enough group breaks from an anarchy, the system will fail. Organized governments will form. Either because someone decides they want to be on top, or because people are trying to resist those who wanted to be on top.
At best, it turns into a normal democracy. At worst? You are stuck with fuedalism, with everyone as serfs.
Direct Democracy is not a materialist government for no reason. It is needed because the technology needed for it to actually work is very advanced tech. Subconscious Consciousness is basically the closest you can actully come to making anarchy work. And even, that is only because literally everyone is connected into a nation-wide communication netowrk with cybernetic implants. Also, They still have a government and bureaucracy because you can't avoid the fact they are outright needed for planet-wide government.
Yep I said that.
Makes total sense, whereas civilizations are always on the brink of collapse, anarchy is always on the brink of order. All it takes is some powerful corporation, or warlord, cartel boss, or general to centralize a bit of power and it's no longer anarchy.
Factions would be the big sticking point to an anarchy government. More so than other governments. If you go back to the decentralization/centralization scale of the authorities and you look at the new teaser highlighting that hiveminds have no factions at all then it makes sense that the authority at the other end of the extreme (anarchy) would be most at risk from factions.