Professional developer and amateur gardener located near Atlanta, GA in the USA.
Goober, I am literally not asking that and yes this is very similar to email. My home instance is programming.dev. We are both still talking. I did not have to make an account on lemmy.ml to respond to you here. I did not even have to go to lemmy.ml to see or respond to this post. This community does not “exist only on one server” by any means.
But just because !books@lemmy.world hypothetically exists doesn’t mean !books@programming.dev or !books@ttrpg.network have similar enough content. You can already view these communities from any instance. You’re essentially trying to apply something like federation on top of something already being federated. They can all have very different rules and different content.
No, should just be your instance admin and the admin of the instance your messaging.