I had not considered the idea of subbing to multiple same-name communities across servers and using the multi-reddit model to pull them into a single feed, but that actually makes all the sense in the world - e.g. would enable folk who want the 'edgier' content of a topic to sub to an instance stored on a server which allowed that material as well as a more mainstream one and then combine them into one seamless view.
I like this fediverse stuff!