I think that the usefulness of bigger screens is limited to certain applications. The article mentioned they were being sold to businesses as in-store displays or kiosks. This makes sense.
Am I going to lie in bed reading a 21" screen? Nope.
My 7" Android tablet is about at the max I would want for ereading. A 5" or 6" is probably even better.
I can see the idea of the 14" Kno for colleges for larger screens specifically for text and reference books. These screens work fine for reading on a desk, but are not "handheld". They are in the laptop realm for portability.
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