:::Check out the meaning of the word "precedent".  It doesn't mean that everything conforms to it.  It is just a precedent.  The reason why living royals should be regarded as exemplifying normal practice is, to me, pretty obvious.  It's because they are living royals and this is an article about a living royal and all our guidelines work according to categories of this kind, not categories of the kind you just made up above.  The case against the singleton seems to boil down to the fact that you don't like it, which doesn't strike me as a very convincing argument.