Regarding uptake: When I plan to invest serious time and effort in a book-writing project, I would make quite sure that the format of the source is something that can be read and used outside any particular software system. I therefore quite willingly go through the pains of writing the stuff in LaTeX.
It may be a fair bit more cumbersome to use than the latest and greatest from Apple, but it has stood the test of time and can be easily transmogrified in a multitude of other formats by using
https://pandoc.org