User blog comment:ToaGonel/The Shadow of a Proposal/@comment-3275483-20160411010114/@comment-958607-20160411090149

I would have to agree with CL here.

Having a directory between the wiki's various different alternate universes is not an inherently bad idea, but it would mean each universe would get only the briefest of summaries. Furthermore, we're not really in the habit of creating vague directory pages for articles that don't do the content justice. If this were to be implemented then the directory would need substantially more subject matter than a short two-sentence summary and face-value information.

For the meantime, however, there is also the option of skulking through the and  pages. While they don't offer much in the way of a content summary, category pages serve a similar function to the one you are describing: their principal function being to map out the pages on the site and offer a directory.