It may depend on whether the photographer in question also teaches workshops, writes technical articles etc. in addition to being a great photographer. John Sexton is an example. He includes some exposure, lens, aperture, film and development data for each plate in his books as an appendix. I see it as a courtesy on his part since he is a teacher and knows many of the people who buy his books are interested in technique, not just the art. I see nothing at all wrong with it. If you aren't interested in the technical stuff, you just don't read it. It's in a section at the end of the book so there are no distractions on the pages with the images.