I'm not saying they're the same. And I am sure some kids favor physical books. But the question for me is the extent to which any of them will spend a lot of e

I'm not saying they're the same. And I am sure some kids favor physical books. But the question for me is the extent to which any of them will spend a lot of effort building and hauling around personal libraries when the digital equivalents are always available. And when it's easy enough to get another paper copy if you're willing to wait a few days. Some will, I'm sure, the way that some people born after CDs and digital music collect vinyl. But personally I'd guess it'll be a similarly niche interest, just another collector's hobby.