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The same reason that if you buy a car you have to know whether to put petrol or deisel fuel in it. The world isn't arranged for your convenience - you have to accept it the way that it is, and know what eBook format your reader requires, just as you have to know what type of fuel your car requires. Demanding that all eBook readers adopt the same file format is as likely to succeed as demanding that all cars run on the same type of fuel.
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