mate, they just got older. there's a stark difference in critical thinking skill between 22 year olds and 18 year olds, regardless of what degree they get (or whether they get one at all).
So you’re telling me that 4 years of continuous and rigorous study on a skill has absolutely 0 effect on one’s abilities regarding that skill? They could have done nothing whatsoever wand would have gotten the same result?
That’s quite a take if that’s what you’re saying, and also disproven by the fact that students absolutely differ in ability depending on how much they apply themselves (studying vs partying). Also disproven by the fact our non-traditional students also improve in their abilities in the same way the 18 year olds do, despite being much older.
What you’re saying here essentially is that the entire institution of education, something developed societies universally recognized as a cornerstone of civilization, is entirely without merit. Maybe you should rethink that position?