Conjecture

A belief community is a collective brain in Henrich's sense: what it can know scales with how many independent minds are connected to what it has learned, not with the capability of any member or of its centre, so a distributed community knows more than any centre can, and loses know-how, as Tasmania did, when its connections thin. A shared, attributed, correctable record is what lets a distributed community keep that advantage rather than only having it in potential. The submitted essay keeps only "A distributed community knows more than any centre"; the Henrich and Tasmania framing comes from @m3taversal's notes and the round-3 drafts (P-TGJGDV8W3T) and was cut for length.

How groups think together