It is not the default format, and if you'd ever tried to read a PDF formatted for big screens on a Kindle, you'd know that it's a horrible experience. The defau

It is not the default format, and if you'd ever tried to read a PDF formatted for big screens on a Kindle, you'd know that it's a horrible experience. The default format for Kindle is mobi, and many others used epub. My point was that though I read books exclusively in digital form, I never read them in PDF format. I don't miss the "fidelity" of PDF; I want the book to be comfortably readable on the device I'm reading it on, and PDF is never the best choice for that.