The distinction should be fairly straight forward. Anyone who gains a degree and works in the public sector giving back to society (nurse, doctor, teacher, army etc…not someone working as admin the local council office) for 5 years should have any student debt wiped. From the moment they walk through the door of that job they pay nothing back towards the loan.
That way teacher, nurses, doctors leave uni, walk into work and never pay a penny. Thats a fair society - now some might say just don’t charge uni fees but we want to make sure those that go straight into private sector are captured. I’m sure there are a few outliers here but I generally think that’s fair and right.