So if I understand you, Lemmy would benefit from a grouping above /c that’s not instance related? Like Usenet had the rec.cats group which spawned rec.cats.siamese? So maybe a /u universe? If I wanted to read about television I could go to u/television which could merge feeds of c/television@piefed.social and c/television@lemmy.world and any other c/television@.? I could see possibilities of abuse but we shouldn’t let the perfect be the enemy of the good. Maybe a /u could be an opt in thing with a manager of some kind to prevent unrelated /c’s from randomly joining.