I actually just remembered something else.
Remember back in the late 80s and 90s when recording home videos really took off? Parents, or at least those I knew, seemed obsessed with recording every single moment of their children's lives: eating, walking, talking, going to Disney, sports games, etc. I'm talking hours and hours and hours of footage likely to never been seen again.
Do you think that this is less of a generational/technology driven thing, and more of a general human fascination? Like the technology is what enables us to indulge in this strange want to immortalize and capture moments of our lives. It's not just today's youth, I'd say.