Hofstadter's term Superrationality is a hell of an example of a word that's totally useless due to the way it violates this principle. If someone who doesn't know the official definition hears you using the term Superrationality, they'll probably imagine that it's just some kind of very strong form of rationality as they already know it, despite the fact that it is very much not rationality as they already know it. That unaired disagreement will quickly poison any discussion that invokes the term.