This post assumes you have a basic understanding of what Lemmy and Kbin are. Which, in turn, assumes you understand at least the concept of federation.
The Issue Currently, the way Lemmy/Kbin (which I will refer to simply as “Lemmy” for the rest of this article) work like this:
Cool, so our user can access content from both instances. They go to Instance #1 to talk about transporation, and Instance #2 to talk about animals.
I disagree with the premise of this post. People who want the experience this post describes can get it already using Mastodon and various workalikes such as Pleroma.
Like a subreddit, the purpose of a Lemmy community is not just to label posts as related to a certain topic or distribute moderation duties, but to build a community with its own set of inside jokes, shared wisdom, history, norms, and rules. To give an example, pictures of swans are welcome on /c/pics or /c/birding, but at /c/geese swans are the enemy. Hiss!!!
Sometimes communities fork because groups within them have incompatible preferences. That’s a feature, not a bug.
I do, however think community migration between servers, initiated by the moderators should be a thing. As anyone who’s been on Mastodon for a while knows, servers shut down, or sometimes develop other issues that mean some people would prefer to be elsewhere.