Yea, Lynn Jennings ran a 4:38 mile and a 10:10 2 mile indoors in HS and then a 2:43 marathon as a senior in HS, did nothing after that right?
And track surfaces are better than 30+ years ago, along with spike technology.
So, yea track times are better, more races set up to be fast. Training is more advanced you would think, but also more about running fast in HS and then hope for the best, the HS coaches don't care as long as they get to NXN or win a bunch of titles.
But, XC is about toughness and grit, those things are lacking these days. Sorry, but pampered kids with helicopter parents lack those things.