

“we have not seen anarchism at a [large scale]” this is extremely debatable, historcally speaking large communities have existed in pseudo anarchistic systsms off and on across the world. The general counter is to claim that hierarchal governance, especially the state, are variously metastable governance systems which outcompete anarchistic communities. But this is only historically supported inasmuch as they did “win out”, but that is not actually evidence that it’s the only metastable form of large scale governance.
to add, the point of Rojavas and “centralized” military forces - this is where syndicalists tend to find their strongest justifications, in having built in systems of military federation that are demonstrably effective without making it super incentivized to do power centralization.