Communities on different instances about the same topic should have the option to essentially federate so a post on one appears on all of them and opening any of them shows you the comments from all of them. This way when lemmy.world is down its not a big deal because posting to any news community federates to all of the communities instead of barely having people see your post. Federation could be decided by the community mods and the comments can have a little “/c/communityname@instance.name” on it so you know which community the comment was originally posted on.
This was the idea behind MultiReddits if I’m not mistaken. In which case a simple operator like:
Fediverse@lemmy.world+Fediverse@lemmy.ml
Could get baked into the Lemmy core to allow this to work.
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That’s the way I think it should work.
That’s still just two separate communities. Like a filter. That’s fine. That’s not what OP is suggesting though. What OP is suggesting is much more extreme.
What are MultiReddits and how do they work?