I actually think that you’re hitting on something that would be a good idea, but probably a redesign of Lemmy (or something new entirely).
Communities should work more like hashtags. If you “subscribe” to politics or technology or whatever, you should be able to get posts from across the fediverse with that label, instead of just what’s on your local instance. Then, you should be able to subscribe to moderation decisions like you can on Bluesky.
Combine those two things and you’ve made something powerful.