I don’t believe there’s a way to bring them together beyond subscribing to both and using your subscription view. There are Github issues open about this idea, so it’s being considered but hard to say if and when they’ll be added.

That thread does raise some good points about automatically grouping by name. Some instances may use a name maliciously or ironically, their posts would end up in the same group.

And we don’t necessarily want to prevent fragmentation, it can be a good thing to have multiple sources. If lemmy world because problematic and gets defederated, you won’t lose asklemmy as you’ll still have the Lemmy ml asklemmy community.