I feel like the books and consulting came from the fact that Scrum, while it can be explained in a paragraph or two, is very hard to reconcile with the idea tha

I feel like the books and consulting came from the fact that Scrum, while it can be explained in a paragraph or two, is very hard to reconcile with the idea that what the business wants is for you to be able to guarantee that you'll be "done" (and define exactly what that means) by a particular date in the future.