I'm only half kidding. I'm a bit of a prepper and I have lots of powerbanks and devices that charge from USB but besides idling my truck I really had no other way to charge any of them in case of a long-term power outage which seemed a bit of an oversight on my part.
Not like this solves the issue. 30 watts (under ideal conditions) isn't much but it's a start.
My point being that running to the hills to escape the zombies and jackboots is a far less practical scenario than supply chain disruption, infrastructure breaking down and societal services collapsing, which is already happening and has occurred recently.
Having back up resources and information electronically is hardly a primary use case, in my experience.
You complaining that books are too heavy is feeding into fantasy scenarios whereas functional systems that have been in place for millennia is far more practical and resilient.