Uhm, as a rule, authors should do none of those things. (I will make an exception for Douglas R. Hofstadter. If you want a book where presentation is interwoven

Uhm, as a rule, authors should do none of those things. (I will make an exception for Douglas R. Hofstadter. If you want a book where presentation is interwoven with content and you can't really separate one from the other you have to read Gödel Escher Bach. In general, though, it’s safe to say that most authors are not Douglas R. Hofstadter. Gödel Escher Bach is also one of those books that’s hard to make into an ebook – and hasn’t been for that reason – because web technologies are lagging behind the printed book so badly.) They need experts to do that. I’m not suggesting that authors start bikeshedding. I want professionals to do their profession. Authors are rarely good designers.