that assumes that you don't create push or pull schemes to sync them
i've been saying it maybe 6 months that "directory" events need a strong consistency consensus. this means broadcasting them and fetching them and keeping the latest versions, at least.
that's user metadata, follow and mute lists, relay lists, there is probably others that need to be added to that list but until the nip guardians and their fans recognise this, it's just gonna be me saying it.
it has to be recognised eventually. we don't need to broadcast everything, just the map.