It's not a free market. The US health system is highly regulated, and most importantly, there is a huge tax incentive for health care to be paid for not by individuals but by employers who buy full coverage.
The fundamental premise, though — that the market is not ideal for healthcare —- remains. For shoes and smartphones, the market is fine. For MRIs and insulin, it is not.
If you hadn't opened with that I think we could have gotten another two or three people extending the chain of indirectly stating as much.