I agree with your entire comment except the very first sentence. I think all the stuff you mention is fantastic for 14-year-olds – Harry Potter and (the first) Hunger Games are great and absolutely "new classics" – but so are some of the standard classics. It's true that most people will appreciate them more as adults, but that doesn't make them useless. Of course time is limited, and prioritizing is tough, so maybe some of the experiential stuff you mention is worth prioritizing above old crusty books, but I still think a good mix is a good goal.