While I think it's great for any kid to move on utilizing whatever avenue, I don't particularly buy into the premise that it's the best approach to not utilize PG. It's a little like saying we've had this pitcher or that pitcher move on to college. That's great, but did they maximize their opportunity by having a pitching coach? 85 plus will generally get you a decent spot in college. However if you had a pitching coach help get you over 90, you have a lot more options, and often better ones.
Same thing for PG. Attending PG events doesn't get you to a college roster, and it can be done without them. The question is can you maximize your options and opportunities without the high exposure they provide. Personally I don't think so, but that's a decision for every family. Just because kids get to a school and a roster doesn't mean they used every resource to get to the best school and roster for them. It's about opportunity and exposure.