You should stop making statements about what other people want and what they think, it's usually just reductive and incorrect.
The supercommunity would be a central authority in the same sense that a regular community is a central authority, in the same sense that an instance is a central authority. The supercommunity wouldn't own all the content, it wouldn't have to be an exclusive provider, I don't know what idea you have in your mind that you're raging against.
Instead of having to follow fifteen /c/aww communities and scroll through all the other communities that you might want to subscribe to for the content you want, it could be nice to just have to subscribe to one that gathers the content of those fifteen communities and keeps it contained in one location for the end-user.
What is your issue with that? That it's too "like reddit"? If that's the case, are you really promoting an idea or just a reactionary response?