So, if cross-posts are not showing up in my feed, then I have to actively look for cross-posts separately in the communities? How would I even know they exist? That’s still not what I want. In other words, there are two kinds of cross-posts: (1) redundant posts to overlapping demographics. I don’t want to see more than one of these. (2) commentary cross-posts. I want to see these as separate posts.
Sibling communities would hide (1) and not (2).
I like that you’re imagining new ways to do this. That’s what I’m trying to do too. This brave new world of community created multi-communities honestly sounds a lot like sibling communities to me. There’s the question of who is making the multi-communities, and to me the natural response is “the communities themselves”. There’s less user friction if a community is just already affiliated with a bunch of other communities voluntarily.