The significant difference is that medical debt in the US is not usually elective. I can choose to sign up for a credit card, or I can choose to apply for a house/car loan, or I can choose to go to college, or I can choose to start a business. Are you gonna choose to ignore going to the ER when you break your arm, or are having chest pains, or are airlifted after a drunk driver T-bones your car? Are you gonna refuse your child’s chemotherapy or dialysis treatments?
The US medical system is fucked up from top to bottom.
(Also note I’m not commenting on whether elective debt in the US is fair, only highlighting the difference between medical debt and other debts.)