Such a beaten-to-death topic, I know, but I just want to get my opinion on the matter out.
I think the reason parents are so absent in YA is because young adults -- teenagers -- try their hardest to keep parents absent from their lives. I speak from experience. I didn't really want to deal with my parents as a (younger) teenager. Shouldn't a book about teenagers reflect that? YA books are about young adults, not their parents.