When is the character limit on HN going to be increased so we can create longer subjects/headlines?
Another is that if we made it longer, people would soon experience the new length as a constraint in its own right.
Editorializing has to do with changing the meaning of a title—for example to put a spin or interpretation on it that the submitter wants to emphasize. On HN, submitters don't get to use the title field as a sort of mini comment box.