Board Thread:Support Requests - Getting Technical/@comment-24045678-20160529004038/@comment-1757994-20160529050531

Sub-categories allow the articles on a wiki to be organized according to their relation to one another. Theoretically, if the only organization you needed was a single hierarchical structure, you could get by with pages, sub-pages, sub-sub-pages, etc., although the names might get pretty long.

Categories allow articles to be organized in several simultaneous ways, which may or may not be hierarchical.

Categories are only as useful as the design and management of them. Most wikis use categories without any thought to how to use them. Disorganized categories are useless.

In you example above, I don't know what you mean by "these pages," but the category you link certainly has a lot of pages in it. I'm unfamiliar with the topic of your wiki, so I can't really comment on how useful the category is. If you find your wiki's categories useless, then maybe it's time to redesign them (or maybe just design them, since they may have just "happened" organically).