Earlier quoted context omitted.
Smartphones and tablets are GREAT learning devices. My experience is certainly the opposite. I do all my best learning without smartphones and without tablets.
You prefer other devices, not everyone does. Most people nowadays own a smartphone but not a laptop. And books are arguably less engaging than apps for a generation that grew up not reading them (hard to swallow, since I'm an avid reader, but it's true).
I agree that some people may prefer them, but they're still awful learning devices compared to more conventional learning devices, and especially so in a classroom.