So this is currently a thought experiment or brainstorming, whatever...
When a community is local, the "home server" for community, that means that the federation is sent out to subscribed servers.
Now it also means that the total subscribe list is only know to that one server... As least I think it works that way, that the subscribe of "home" server is the complete list and everyone else has partial lists.
There is a lot of the structure of a community that offers some data opportunities to Lemmy. For one, a community object can be edited by any of the moderators. and any moderator can Lock a post, Remove a post, etc.
Reddit has a not-often-used Wiki feature, that even basically means more than one person could edit content too. Other than the sidebar of a community, I don't think Lemmy has any concept of multiple people being able to edit a post or a comment. But again, multiple mods can feature or lock a post... so there is some concept of multiple-actors on data.
I think when you get into creating flair / tags and even playlists (multi-community lists), you want multiple people to be able to edit data. Which in Reddit was the Wiki structure.
i know some of it is kind of a waste of time.. because people tend to avoid Wiki and highly favor posting the same repeat questions and content over and over, reposts. But a man can dream, can't he :)