@JSWolf. I read mostly Dutch books. I must say that 98% ebooks mimics the paper editon (as I tried to describe in my previous post) but all publishers use a default CSS that is to rigid and contains to much redundancies.
I used carefully formatted vs poorly formatted books. With carefully I don't meant to imply that that is the formatting I personally like.
I also make quite some changes to the CSS to get it right (for me).
I also read English books from time to time. Some titles I purchase, others I download first (if I don't know the author).
I have noticed that many of these English books contains lots of <div> formatting where I would expect a <p> formatting. I don't know if this is the default formatting that most US/CA/UK publishers use. Or that it is the result of a poor Calibre conversion. I'll never use Calibre to convert a book from one format to another (mobi > epub). But I've seen many downloads containing lost of "calibreXX" sh*t and those books are always poorly formatted.