These are still somewhat aspirational, especially when we're talking about YA dystopian fiction. The idea is to crystallize the unease younger readers feel within our modern world and magnify it to literal apocalyptic proportions, then present reader-insert heroes and heroines who go about fighting for and then building a better world.
Whereas Sword & Sorcery is sort of primarily about the power fantasy; a larger-than-life powerful figure who can exist in and dominate a dying and unforgiving world. There's an exploration-of-the-unknown feel there also which I imagine garners less demand among today's readers (what with the constant barrage of cable and internet history & travel series taking the mystery out of "exotic" locales the world over). It's more about survival than building a better world.
But then that basically just describes one of the primary differences between heroic fantasy and S&S.
That sounds like its almost all about the heroes being heroic than the "readers today want to live in the setting the authors create".
I can buy that heroes that do hero things are more popular with more people than simply having protagonists that do awesome but meaningless things.
In detective/crime/police fiction, it almost feels like what is popular now are reasonably-goodish-but-with-definite-dark sides going after monsters. (The crimes in the Prey series, for example are horrific and the protagonist probably doesn't look nearly as good after the past summer).