Alas, custom and guarantee are not the same thing. It's important to ensure that people know their nodes have been retitled, I think, and simply doing so "customarily", but not universally, is a failure. In other words, I agree with davido's assessment (it's a good idea to include that functionality) and tye's assessment (we should err on the side of laziness — particularly appropriate, given that Laziness is one of the virtues of programming).