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As long as a smartphone has a small (to my eyes) screen I don't see how it can replace many of the functions. Sure I can read on my smartphone but with a readable font there are far fewer words per screen than on a dedicated ebook reader. If you make the screen large enough then it's not a very portable phone.
Let the authors of the various articles declaring the death of single use devices reach 50 or so and use reading glasses and then see how they feel about using a small screen all the time.
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