Board Thread:General Discussion/@comment-5706853-20140219225008/@comment-366087-20140219231805

Short answer: It is a style choice

Longer answer: While one thought is "everything which applies", categories which are filled with nearly *every page* grows large and after a while becomes useless; there will simply be too many options to scan through swiftly. For example, this is why "Human" is not a question/option asked in a consensus or survey; everyone is human so it is a useless fact. (and don't get me started on "default-level" Cats such as Sons and Daughters… *everyone*(human) is a son or daughter…)

Now there are some larger heavily-trafficked wikis where size is just a matter of course. Which is why if there are more specific Sub-Cats it *may* be better to apply (or "tag") articles with the specific SubCat and leave the parent-Cat for those pages which do not apply to the Subs.

Bottom line: it is a matter of what works for your wiki.