Too general a statement. Sure, an engaging consistent story is much harder than, say, the average cookbook or travel guide.
But many textbooks in science and math seem like absolutely Herculean effort. Gravitation[1] by Misner, Thorne, & Wheeler (a work of non-fiction) in my opinion would be the equivalent in intellectual effort to several thousand average works of fiction.
Too general a statement. Sure, an engaging consistent story is much harder than, say, the average cookbook or travel guide.
But many textbooks in science and math seem like absolutely Herculean effort. Gravitation[1] by Misner, Thorne, & Wheeler (a work of non-fiction) in my opinion would be the equivalent in intellectual effort to several thousand average works of fiction.
[1] https://www.amazon.com/Gravitation-Charles-W-Misner/dp/06911...