it's the practicality .
yes change of font size is useful - but the facility to change mid-book without getting out of a chair or bed is a pleasure .... [haven't got as far as reading in the bath, yet; but the Pocketbook with its 'turn pages on a twist of a wrist' may let me .....]
also to be able to buy and start reading a book within minutes rather than wait on the post or have to make a journey into a store.....
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