Their books are on these devices. They don’t have physical books anymore.

Frankly, probably the best part about them, potential eyestrain notwithstanding. Having a sack of bricks strapped to your back all day, or constant retreats to a locker, wasn't contributing to my quality of education, LOL. Having an electronic device as a reading and writing and proctoring tool, sensibly extended with the bare minimum of other capabilities, is not a bad thing at all, IMHO.