I think I see your point but 10% (or heck even 1%) of books being engaging and worthwhile is still more books than anyone could realistically read in a lifetime. Good books are a fair bit more accessible than good urbanism or rural activities are to a suburban kid (speaking from experience sadly), and I don't think people extolling the values of reading are suggesting doing it completely in lieu of other productive activities like fixing a brake cable (fwiw probably an activity better assisted by YT or maybe even TikTok than books).