Well be careful don't drop the phone lol 🫣
I mean that's the most scary thing tbh...
Paper is a bit harder to cause immediate damage... like if you spill water, just quickly grab a notebook and start pre-emptively copying in case of damage. For a phone? Good luck fixing it lol, and the phone will eventually die, you might not have replacements for the files to be copied on to, but I highly doubt paper is gonna become unavailable for purchase any time soon.
Too bad you can't fit 500 .epub files worth of physical books in a backpack