It also fits in a handful of bytes or kilobytes what would take half a gigabyte to communicate in a video - sometimes making the difference if you have limited bandwidth or a cap on monthly traffic.

It's also ridiculously easy to cache (download a book in 9 seconds, board a transoceanic flight - no problem)

It also doesn't require the right sound and lighting conditions to see and understand a video (either those conditions, or good noise cancelling headphones - and now you're unaware of your surroundings)

It's also the only viable option on insanely low power devices which get months of battery life per charge.

It's also something you can read at an incredibly speedy pace if you are good at it and practice - though occasionally a decent audio/video player will be of use with this.

It's also something you can fall asleep while consuming, and tomorrow you won't have much trouble finding exactly where you left off.

I could continue..