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.
Is that so different than how the fediverse currently works? Subscribed content is already being federated across instances I’m just asking it to be organized together. When your instance federates with a community on another instance it doesn’t get the entire “5-year” backlog sent to it; only new posts and old content that someone interacts with is sent.
I think there are limits to the scalability of the fediverse, in general, I just don’t see how organizing the data differently is breaking anything. Only the most limited servers are going to be impacted from receiving content from three /c/butterflies instead of one. Most people are probably subscribed to the duplicate communities already; I certainly am.
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