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Most devices include a PDF reader, but not an EPUB reader. Yes, you can download one, but as a publisher, you can't expect your readers to jump through that hoop.

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EPUB / MOBI reader is not a problem this days

That really doesn't speak to his statement. The majority of devices read PDF by default where EPUB/MOBI, the user needs to go get an app.

10 You should publish PDFs because devices include readers.

20 Devices have readers because everyone publishes PDFs.

30 GOTO 10

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