Steve Bennett wrote:
There are also cases where categories do not need to belong to another category to be "useful", like "1911 Encyclopaedia" or "Pages needing cleanup" or whatever. They can be made *even more useful* by categorising, but that's not saying much...
Steve
They are self-explanation but, how do you know that such category exist? It's the reason of the category trees. So you could arrive to "Pages needing cleanup" from "Wiki maintenance" and "1911 Encyclopaedia" from "Articles by sources". And, would you write "1911 Encyclopaedia" or "1911 Encyclopedia" ? It's an easy mistake, so you end up with both categories...