Otherwise you have to find ways to explain stuff to the audience when the characters grew up in that world and should already know all about it, so don’t need to discuss things.

…you mean worldbuild organically like any other story set in a universe that isn’t our own? Countless shows and stories have been doing that for centuries, why should anime get a special little exception?

Also idk about the newer ones but the old ones last forever. You might need to change their battery but that’s not too hard. I got a kindle keyboard that’s been going strong for over a decade now.

Also kindles work fine with calibre, you just need a different file format. Mine can read PDFs! (I do not reccomend reading PDF scans on a kindle)