Most healthcare is not that life and death. A few years ago I needed surgery - it was scheduled for 2 months later (originally 1 month but then the surgeon got COVID so rescheduled), if I had any incentive to I could have found plenty of other surgeons in different hospitals who could have done the same surgery - but I have no incentive to.
My in-laws lived near the Mexico border (until they died) and their church around the country regularly sent members to them when someone poor needed surgery to arrange with a much cheaper hospital in Mexico to take care of them. Mexico doesn't have the same standards as the US (or didn't 30 years ago), but it isn't hard to figure out which doctors are just as good as anyone else in the US if you research.
My in-laws lived near the Mexico border (until they died) and their church around the country regularly sent members to them when someone poor needed surgery to arrange with a much cheaper hospital in Mexico to take care of them. Mexico doesn't have the same standards as the US (or didn't 30 years ago), but it isn't hard to figure out which doctors are just as good as anyone else in the US if you research.