Unfortunately, not. Multi-reddit just lumped everything together, which allows for duplicates. Using my Star Trek analogy: if there was a new episode, and both communities had a thread for discussion, I'd have to go into both threads to talk about the latest episode. What I want is a single thread being posted to one community automatically gets pulled into the other, and comments can be posted on either site but appear on both. That's the way federation should work, but it doesn't currently work like that. That's my frustration. If I wanted to go to multiple communities to have the same conversation multiple times, I'd search for web forums that have existed ever since "Web 2.0" was a thing in the early 2000's. There's a reason people tend not to use those small forums anymore, and favor larger sites like Reddit. Hopefully it's a change that can come to the Fediverse sooner rather than later.