Getting back to the original topic, I personally don’t think that every 14 year old can sit and learn all day. Secular studies is a change for them. I don’t think I would have been able to sit and learn all day in 9th grade. even now, 4 years I have a hard time sitting through all 3 sedorim. I would find it easier to leave 2nd seder early and skip night seder and instead go to college.
Now, I just feel bad for those kids who aren’t cut out for learning all day, but are sent to a mesivta where there is no secular studies, and are essentially on a B”M schedule at age 14.