Did somebody say 'global namespace'? I spent years working on one of those as part of Urbit... In general, I think you're right. Each conversation is an append-only log at the lowest layer, and I see no reason not to expose that fact as a global namespace, as long as permissions are handled gracefully.
Of course getting permissions to work well might be easier said than done, but I like this direction.
Of course getting permissions to work well might be easier said than done, but I like this direction.