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Probably since everyone has their own idea of what a perfectly formatted ebook looks like and most publishers have to deal with trying to make an ePub ebook look good on multiple devices with renderers that often have widely different interpretations of the ePub standard.
Heck, even Amazon who have proprietary ebooks can and do have issues with attempting to make their converted ebooks look good on everything from a small smartphone to a 32" high res monitor despite their fondness for media queries.
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