Another layer to this is that even if they have an active hobby farm that is self-sustaining, do they have medical skills? Can they set a broken leg, deliver a baby, and pull a rotted tooth? Do they have the technical skills to maintain various equipment, even if its renewable?

The irony for a lot of the prepper community is that the most efficient "off grid" social structure is concept that they strongly oppose, the commune. A small community working together for a common good in a shared space.