According to Help:Category_FAQ:
"Categories are used to group other pages together. Almost no content should go on category pages. For example, if a category groups people buried in a particular cemetery and there is general information about the cemetery, it should go on a free-space profile and the category page should link to it. See Page Types for more information."
In some cases, this has been misinterpreted to mean that no content should go on category pages. As of today, there are over 86,000 categories in our structure that contain little to no content on them.
Should this be expanded and clarified?
"Categories are used to group other pages together. The only content that should be on the category page is a brief description (no more than paragraph) on the intent and purpose of the category. For example, if a category groups people buried in a particular cemetery, you would add a brief description of the cemetery, such as where it is located, to the category page. Any other general information about the cemetery, including the history, detailed cemetery information and notable interments, should go on a free-space profile and the category page should link to it. See Page Types and Suggested Text for more information."
Would this make the help page clearer?
Edit based on the comment from Isabelle:
We also have Help:Category Creation and Removal that states:
"Category pages can include one or two sentences about the category itself, especially if there is any confusion about when this category should be used and when it should not. Specific instructions about when to use and when not to use the category can be helpful."
This could be changed to:
"Category pages must include one or two sentences..."