(1) There are low-income, middle-income, and upper-income individuals with student loan debt so large it will never be paid back. I know at least two people in each income bracket. The ones from the upper-income bracket come from families that are well-off, but not so well-off that they are willing to throw away a quarter of their life-savings to payback their child's student loan debt.
(2) I know people with $200K+ in student loan debt, but who pursued degrees which have career trajectories not aligned to paying off such debt.
(3) Even at elite institutions, and even within different acclaimed grad programs, the 'country club' experience of American undergrad education is creeping in. That is, even at elite grad programs, students are beginning to treat education as secondary and socializing, partying, etc. as primary. Grade inflation, among other signs of systemic institutional rot, is rampant.
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Having graduated and joined the professional class, as well as being connected to various professional social circles spanning different industries, I can also attest (anecdotally) to witnessing only ~20% of the people I know spending the vast majority of time at their job doing work rather than playing around. To those with limited data on what actually takes place at the mid and senior levels of management in large corporations and firms, I can tell you many stories of people making ~$130-$200K/yr while spending a non-trivial amount of work time shopping on-line, scrolling social media feeds, etc.
Take that FWIW.