Even just looking through the list of communities I can already see two separate "Fediverse" communities on different servers. I'm assuming the posts aren't shared. How do we keep related discussion as central as possible? Just hope one wins and everyone posts there or is there a technical solution?
I mean, I keep coming back to that being the entire point of the Fediverse.
Sure, it means in some ways discussion can be different on different servers, but isn't that the entire point? To not have a single point of failure? If one instance puts down draconian rules that makes a certain community unwelcome, then why not move to an instance that you feel is welcoming?
In other words, post where you feel like, and/or where the people are. I really don't have an issue with cross-posting to other instances or having different discussions about the same subject.
Some instances have defederated with others, so another aspect of this is having multiple communities means people who have been defederated can still take part in the same community on a still federated instance.
I get it but I worry it'll limit the success of Lemmy. Reddit's drawcard was finding THE sub for a topic, if the same discussion is fractured across many different indistinguishable ones it'll be like a bunch of random small chat groups which is something that already exists. Also means that maybe you'll be subbed to the "fediverse" sub that sucks and not realise there's a more established one you don't know about.
When I moved to Korea 3 years ago then I found r/korea and after a year or something I've been banned from posting and commenting there after my 2nd post because of some technicality (posted a link to my a video on my own peertube instance instead of a 3rd party like YouTube). A later found out there was a r/living-in-korea one which anyway fit much better and I was able to post and comment there.
So in my mind having several is much better than having one.
What would be nice is some UI to group and view them together as a user though.