There was just something on HN about how you have to be a seasoned experienced expert before you're allowed to talk in simple terms to people, otherwise you're socially expected to couch in jargon and terminology ideas.
Dressing up ideas in purple might be a social signal necessity but it's unfortunate.
There's not a big market for 10 page books.
A lot of business books suffer from the same issue. There's some genuinely interesting or innovative idea, but you could explain it to a bright audience in about 10 pages. So you fluff up everything in order to have a book you can sell.