The major issue I see with Lemmy communities and Kbin magazines, is that they both rely on a single server to be up and running to even work. Sure, you can cross-post to several communities at once, but that generates one different thread per community. Add to that the fact that to even start to implement a single distributed thread properly cross-posted to several communities, they must take into account that a given user or server may be defederated from one community but not another - should the user not receive the message if at least one server bans the user, or should the user be allowed to receive it if at least one server allows the user to receive it?