To compare the US and UK: In the US, the life expectancy is 76.5 years for males and 81.4 years for females. Annual healthcare spending is $14,885 per capita. In the UK, the life expectancy is 79.1 years for males and 83.0 years for females. Annual healthcare spending is $6,747 per capita. Even if the UK system is bad, it seems like the US system is much worse if they pay more than twice as much for poorer outcomes.
I think you have to account for multiple factors like Americans are generally unhealthy people, the people have better access to the top of the line medical technology, people actually spend and consume more compared to the EU. This blog post explains a lot more.
https://randomcriticalanalysis.com/why-conventional-wisdom-o...