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Amazon’s ebook store front (as well as the internet in general) is flooded with AI slop. The internet is a place where the signal to noise ratio is dropping rapidly.
Physical media is necessary. Especially books. Especially the kinds of books regimes might want to ban. When it’s time to rebuild, we’ll need firm ground to stand on, and physical books work as long as you can hold them.
DRMless digital is great - I have a calibre library of thousands - but still more vulnerable.
Canticle of Lebowitz is a great post apocalyptic novel. After the nukes, Catholic monasteries preserve the ancient tradition of copying down manuscripts. Text doesn’t require any form of infrastructure.
There are also many texts/other media that are not available in any digital format. Obscure or older. For as much of an Information Age we are in, a lot of knowledge is being lost through neglect.