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Well, if you have a very technical book with graphs, figures, tables,charts on virtually every page, you will find there's NO format in the world that is an ebook format, for the 6-'' sized ebook readers.
PDF is an excellent format to present technical documents/books with large portion of non-text content, I doubt if there was any better format available.
ebook itself is not necessarily for reading devices, for a very long time people read ebooks on their computer screen. So ebook format is not necessarily the format for ebook reading device.
So PDF is definitely an excellent ebook format, though not a good format in case of book with graphs/charts/tables for 6-'' sized ebook reading devices (Dude, is there any format could do that better than PDF? I don't think so).
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