Again, there's like a hundred topics that have been omitted from history books, and saying which three of those your book doesn't cover isn't helpful if you're

Again, there's like a hundred topics that have been omitted from history books, and saying which three of those your book doesn't cover isn't helpful if you're trying to promote a book. If I were to write a book about Ancient Egypt, I wouldn't say "I'd like to present to you my new book about Ancient Egypt. The book is NOT involved with Middle Kingdom metalworking or the lives of lower rank scribes. Thank you for your attention." or anything like that, since you'd still have no idea of what it is about. Your uncertainty about the content would have decreased very little compared to some other things I could have told you in about the same volume of text -- for example that the book was actually about the estimated quantitative economic history of Egyptian agriculture (crop yields, taxes, etc.) from Old Kingdom to Roman Egypt or something like that.