I think the "bored PG student" problem is a real problem in some school settings, but much less so in high achieving school systems. Our school system is fairly easy through 8th grade, and becomes much harder in high school. I don't think my daughter is PG, but some of her friends clearly are. But everyone is challenged in high school.

Off topic, but Google's power can be a bit unnerving at times. I looked up "David and Goliath Princeton breakdown" on Google, and the sixth entry was Wren's post, and this was just 20 minutes after he posted it.