Especially for a group that meets recurrently, it seems worthwhile to experience many different conversational contexts, some more structured and some less so. More structured contexts seem to be hard to sustain - the weekly sessions at my house focused on goal analysis often "devolve" into semi-related conversation.

Completely separating fuzzies and utilons doesn't seem possible, e.g. the quantum physics lessons are likely to be at least somewhat entertaining, but it makes sense to try to focus on one or the other for a particular activity.