Its just the current mass education system is more of a giant filter test than learning. Actual learning process is deeply personal and transformative.
Instead this is a high-stress environment with little actual learning and more of performance show to force feed people with data in factory-like setting.
Those who learn for filter tests and those who learn out of interest for the subject are different people. Turns out the system is geared for the first type of people and their educated knowledge doesn't hold when they lose interest in it, they have to take "refresher courses" and "recertifications" for everything they learn.