User blog comment:Brandon Rhea/Wiki Modernization Stage Two: Page and Article Headers/@comment-1280533-20170317092605/@comment-5558012-20170318002920

The number of categories on an article doesn't really matter if they are solid, constructive categories (that are also more than an empty page). For example, we have a large number of song categories, given a large number of songs, so some of the most notable articles (example: The Chipmunk Song (Christmas Don't Be Late)) have a large number of categories (almost all the song categories). Every one is useful and clear. Some wikis do go too far though by including trivial categories (such as "X appears in episode").

@Dark M clowN - Thanks.