I remeber reading tons of junk and pulp as a teen decades ago. If anything, the teen section is more complex then pure hero fantasies and repetitive scary stories that used to make the bulk of reading. Yes, lord of the rings was popular before and now. But the stuff people read en masse was not lord of the rings and certainly not some kind of smart complex stuff.

What used to be read a lot was literary equivalent of a sitcom or slash fantasy.