Self-management is only as good as the thing being "managed" is desirable to even exist. I for one do not want anarchist-run oil spills or nuclear meltdowns or advertising firms, so I'm not as big into it, though it has some uses in the short-term and in certain contexts, for example the SeaSol model of labor and tenant solidarity. On the grand strategy level, industrialism, urban society, and farming are all pretty fucked*, and I don't trust syndicalism to necessarily get us to where we need to go as for the most part it came from a specific type of extractive/manufacturing economy in an industrial mass society with a workplace and domestic household division and many other premises that I take issue with.
*from either an anti-civ or just what ecological collapse if economic growth continues will do perspective