I’d say it’s the opposite. I generally browse by topic (for instance, fediverse) instead of staying on the front page. So, as things stand, I just pick the largest community on the topic, and participate in that one. This naturally leads to centralization. If instead, I could “merge” multiple communities, then I’d easily participate in all of them.

To clarify, I want there to be multiple separate communities on the same topic, with potentially separate moderation and rules, etc. I just want to see them on the same feed (kinda like the front page, but topic-specific; also, it would be nice if it was auto-generated when I subscribe to communities of the same name).