In Reddit, users can create lists of subs, called “multireddits”. And you can browse the content of all those subs in a multireddit as if it was a single community. You can also share your multireddits with other people.
Reddit itself implemented the idea and never touched it again, but it be amazing in the federation. For example, someone who’s interested in cooking could create the following multireddit multicomm:
- [email protected]
- [email protected]
- [email protected]
- [email protected]
- [email protected]
- [email protected]
That increases discoverability of the communities across the Lemmyverse (as people share their multicomms), and also makes it easier to handle redundant communities across instances. Because of that, I feel like the concept would be right at home in Lemmy.
kbin also has a discussion about this.
From the discussion in your link: I personally don’t like the idea of making them automatic, I think this is better handled by the users themselves. That also helps with the URL: for example, if you (in Readit.Buzz) created a public multi called “mymulti01” and I (in Lemmy) wanted to access it, I could either check your profile and click on it, or perhaps access it through https://lemmy.ml/[email protected]/m/mymulti01. Then I could copy it if I so desire.
Sometimes simpler “let them do” is the best approach.