Well yes and no. I think the point is to avoid 500 arbitrary half dead Cat communities, or to help users find there niche for their town or interest so you aren't left with multiple dead communities reposting questions all over the place hoping to find the community with the answer by sheer dunb luck while also thinking that Lemmy is dead.

Finding out that the official photography sub lives on glasgow.xyz is a big ask. So maybe it would be a good start to keep things fractured but allow an easy way to group them into a feed like the way multis work. Looking at my subscribed list is a horror show right now and I shudder to think of the infighting when three growing communities butt heads trying to spam each other's users to grow there own. If I can organise my coms into categories and folders that would be a start. Maybe creating feeds by tag? And subscribing to tags?

I think something like this would probably be done user side, maybe with some option to share it, much like the "multireddit" feature of reddit. Each individual community is still moderated and run by their mods and local instance, but the user can choose to aggregate multiple mags/communities together.