Looks like Slate's figured out the magical formula:
Somewhat annoying article about YA fiction = INSTANT SPIKE IN TRAFFIC!
Whatevs. Despite the broad assumptions made in the Slate essay, I'm sure that every author — regardless of the age range s/he's writing for or the genre s/he's writing in — has a different technique and viewpoint and vision and experience and outlook.
Not everyone has to take pride in what s/he writes, and not everyone writing has to have strong knowledge of the market s/he is writing for. If some authors assume that there isn't any crossover between YA and "literary" fiction, then, heck: That's their loss.
UPDATE: Annnnd... flounce.