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Rendering PDF's is MUCH harder than mapping a text file to an e-ink screen in your chosen font with a few tag formats.
I suspect the hardware requirements make for a more universal device (a.k.a. tablet or laptop) so why would any manufacturer limit themselves to a 'PDF reader' when they can sell it as a tablet? I agree there are some software tricks you are asking for that could be applied to all devices in terms of notations and jumping around.
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