It's not like that surgeon was sitting in front of his computer playing solitaire all day long.
There's zero justification in forgiving the loans of some public policy grad student from Georgetown University ($$$) who works for a decade as a Congressional Staffer or at an NGO before joining some high-falutin think tank or consulting firm, but not doing the same for the surgical resident who works 80-100 hrs a week at nearly minimum wage for 6-10 years. The distinction is purely semantic.
I don't actually have any problem with the cap, as it is consistently applied across all fields. However, for PAYE/IBR to be sound public policy, it needs to have lower interest rates. Under the current proposed PAYE plans, the government is actually going to have to "forgive" MORE money at the end of 25 years than at the end of the 10-year PLSF program, because of accrued interest at 6.8-8.4% (doubling the principal every decade). That's absurd. It's also a huge debt bomb that never gets smaller for the people who are in this program, which means these people would be in a world of hurt when applying for mortgages or car loans for 25 years. That's untenable. Delayed gratification till death is a little bit too much. And if say at the end of 25 years, our government's budget remains broke, it could very well renege again on full debt forgiveness, and that would be morally reprehensible if during that time the principal had doubled under the government sanctioned payment plan at 6.8-8.4% interest.
The question is why do we still need interest rates (other than a minimum service rate) if at the end of 25 years it's all going to be forgiven anyway? You've basically precluded default risk. By having the huge interest rates, the federal government is only going to find itself with large paper write-offs of forgiven loans 25 years from now.