Folding phones sure eventually. They’re small enough that folding would actually have benefits unlike the Sage and I’d imagine most ereaders. Outside of maybe the 5 inch ereaders I doubt halving in any single direction would actually be of a benefit. But if I could fold my iPhone 13 pro max in half cutting the vertical height in half? Yes please.
For ereaders I’d agree a scroll which clicks when fully extended seems the best solution. It allows for greater size with great portability. How viable this is currently eh probably not for awhile yet.
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