Quote:
how would supporting just the pdf format be better than supporting both pdf and epub?
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Have you ever annotated an epub with a stylus (rather than just highlighting)? I mean: it is simply not possible to scribble notes into epubs or mobi-files. Sony wants to keep it as simple as possible, uniform and consistent, so they only use "paperlike" pdfs. That's the only reason I can think of... and converting all your epubs to pdfs takes probably 10 minutes with calibre: it could be worse.
Edit: rkomar was faster