I think you are missing the point of Lemmy if you think it’s “too decentralized”. Too many Reddit refugees are eager to bend Lemmy into some kind of Reddit-shaped clone and failed to realize the differences are mostly intentional.
I actually think that multiple communities about the same topic isn’t as big of an issue as most people make it out to be. If two “competing” communities grows to be large enough you will eventually get the similar content and it doesn’t really matter which one you sub to, unless of course if one is “toxic” then the choice is clear. And you can always sub to both.