Earlier quoted context omitted.
I don't think Reddit's shown us anything of the sort, really. I expect people have a habit of reading too much into this kind of thing.
Look, when everyone gets to be king of their own sandcastle, you obviously end up with a larger number of smaller castles. But the not-so-obvious consequence is that because people implicitly know they can just start making their own sand castle, it foments divisiveness because all of a sudden everyone "knows" they can do a better job moderating/curating/whatever, and they're sick of seeing $content_type in what they…
On any *chan style imageboard, this isn't a thing. You can hide posts that you don't like, but by design, all posts are equal. If someone posts something you don't like, your options are to ignore it or respond to it, but it's there, in the open, for all to see.
This, I think, is the better system, combined with the default anonymous posting style of these boards that completely ensures that any post is judged on its merits, rather than the identity of its poster. That's not say that board culture doesn't exist, it does, but it exists purely socially, rather than being a feature of the software. The things I've seen happening on YouTube and G+ and Facebook have convinced me that existence of a coherent identity has zero impact on people's behavior.