Memmy - An iOS client for Lemmy

Agreed. That feature bundled with a lists kind of feature would be great.
As when you browse a new instance you might come across a community for a topic you are already subscribed to on another instance. Like „technology“. Now, since you can’t really tell if they post the exact same stuff as the community you already subscribed to, it would be neat if you could just subscribe to the new one as well, group them and then read just the technology group posts.