Oh, and epub is not really complicated. It is just html-tags and some css. Of course, if you have complicated books, it gets more difficult, but it would be more difficult in a word processor or layout engine too. And of course there is the most common case: the source format is garbage. That's not the fault of epub though. It would be difficult to make a print book out of that too. Never done print, but I would think, there are nearly no easy cases apart from if you have a source in latex and happy with that typesetting.
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