Any mass-production or limited-resource system will be relatively more beneficial to someone than someone else, and there are many incompatible but defensible ways to measure benefit.
Except to the extent that locking the student in a jail for 6.5 hours every weekday would be considered preventing the student from seeking other educators.
Being a farmer now, I feel I missed out on a lot of education because of school. Planting and harvest season in my part of the world is May and September/October. Having grown up on a farm, there were lots of opportunities to learn, and I took in what I could, but many years of learning were wasted because of the requirement I be in the classroom during these key times of year.
On the other hand, I spent my summers and weekends learning about technology, how to program, etc. It didn't come with the same timeframe limitations so I was able come away with a much greater understanding. With that, you are right that you can always seek education, but sometimes school gets in the way. That is a problem.