True, it some like myself can't read on a plane due to motion sickness. Watching a video is fine, but not focusing on text.
I've never finished reading more than a page in a moving car without feeling nauseous.
My mum noticed that if she sets her kindle to 2 or so sizes larger text, she doesn't get motion sick any more.
Yes. I love to read books on a 17 hour flight instead of being able to watch TV shows, work on programming problems offline or the countless other productive things that a laptop can provide.