And conversely, I can't see a disinterested, non-mechanically inclined, non-detail-oriented recreational diver being the least bit motivated to spend all that money and time for a class, so they probably wouldn't bother.
I have, however, seen plenty of kids decide a 60k mile service doesn't look that hard, only to have their car towed to a shop with spare pulleys everywhere. I once basically wrote off my car when I screwed up a $100 routine service, and my mechanic was a champ about helping me out with that. Before I knew anything about cars, I did a brake overhaul straight from a Haynes manual before I could even drive my first car. However, these sorts of things led me towards my engineering degree and the automotive field. Had I gotten my first car after I had a job, I would have probably gotten one that worked and taken it to a mechanic as necessary. I understand setting a minimum bar; I also understand the need for hobbyists to tinker; I also understand that a parts availability program is not necessarily for the betterment of today's youth.