If the communities could federate, then posting to /c/rust@lemmy.ml will not automatically repost it to the other 2, instead subscribers to one of the other 2 will just also be able to see the post. I.e. it eliminates the need to subscribe to all 3, and thus also the need to post to all 3. That’s how I understand it at least.
Won’t we end up with a bunch of re-posts, though? I’m not sure it solves that problem.
If the communities could federate, then posting to /c/rust@lemmy.ml will not automatically repost it to the other 2, instead subscribers to one of the other 2 will just also be able to see the post. I.e. it eliminates the need to subscribe to all 3, and thus also the need to post to all 3. That’s how I understand it at least.