The medical systems of other countries definitely deliver better results on average. It's plainly obvious if you look at a top-level metric like life expectancy

The medical systems of other countries definitely deliver better results on average. It's plainly obvious if you look at a top-level metric like life expectancy. However, from personal experience in the U.K., Germany, and the U.S., the U.S. system unquestionably delivers better outcomes to wealthy people with health insurance. It's not surprising that the U.S. policy remains in place: it benefits the elites. Also, healthcare makes up something insane like 20% of GDP. The amount of people employed by the healthcare sector is staggering. Spending less means putting people out of work. It's going to be hard to sell that idea.