User blog comment:Agent Maroon78/Articles to Update/@comment-4403232-20140602233153

A couple of the categories on the "Up to debate" listing are standard wiki categories for maintenance that are automatically created, such as "Candidates for Deletion" and "Pages with broken file links". The former is added when the Delete template is used, and the latter is added when a wiki link doesn't lead to a page so that users can fix it.

As for the Image Categories, they can serve a legitimate purpose if used properly and consistently so that all the images on the wiki can be kept organized. However, they are only useful if they're applied to all the images on the wiki. If only a few have the category then they're pointless.