Why Write another History Book? is a question that has been closed. It's not a strong question and that's probably for the best, but I'm not sure people are right to say it's out of scope. A better but similar question would be to ask about the why and how of historical revisionism. Or perhaps a question about the history of historical revision with respect to a certain subject. These seems like a reasonable questions for this site, but the faq doesn't have anything to say here.
So are questions on the historical method (not the facts and events but how we study and interpret these facts) in scope?