If the spirit of the fediverse is to spread everything across small instances, then i think it would be really important to make communities, especially niche communities, easier to discover across instances. Since it is not planned to crawl federated instances community catalog, i think instance admins, or maybe even the lemmy software itself, should point more obvious to services like https://lemmyverse.net/communities to search for communities instead of the lemmy (or mbin, piefed) internal search. It’s been a while since i have seen someone talk about these community crawler services.
Instances that don’t federate a remote community won’t even list this community in the user profile of a moderator.
As more people use https://lemmy-federate.com more niche communities will show up in most large instances by default
Imo its the ideal solution since it populates the posts in the all feed for people who don’t know about the site to still see