[burnished]

You're acting like the current methods aren't greeted with the same cries.

To answer your question; because they are demonstrably required. Different subreddits already moderate to different standards - why do you insist that each community needs to fit in as part of the same whole?

[cubefox]

Because Reddit isn't a social networking site where you create your own community by following people. In Reddit other people create those communities, because Reddit is a forum.