User blog comment:Brandon Rhea/Wiki Modernization Stage Two: Page and Article Headers/@comment-1280533-20170317092605/@comment-5558012-20170317135223

I disagree with categories not being used for navigation (I would agree that say Hidden Categories shouldn't show). Categories provide structure and organization (which is highly useful for editing and bot work) and with those comes great navigation potential. Many wikis mistreat categories and have no structure (categories aren't categorized, have no descriptions, are treated as basic tags), hurting any navigational benefits. On one wiki I specifically provide a page of categories for user navigation. Personally I'd say categories are like images - users tend to mismanage them.