I actually do not disagree with the statement that life expectancy, lifespan (two different things btw …) and death rates (another related but not quite the same thing) are inadequate measures to judge a healthcare system without controlling for other confounding variables.
And there certainly are, as your cite posits, genetic contributions to longevity, especially to being a member of the outlier group of centenarians. What those genes are however is not yet something too well worked out, and how much they differ, if at all, between the subpopulations identified by racial and ethnic groupings is not established.
Take, for example, that factoid about Hispanic American life expectancy. How does a purely genetic explanation explain that Hispanic Americans (largest group of Mexican descent) have a life expectancy at birth 2.5 years more than non-Hispanic Whites but that Mexicans have a life expectancy 2.1 years less than non-Hispanic White Americans? One could, outside the scope of this thread, have some interesting discussions about the “Hispanic Epidemiological Paradox” but waving it away with a blithe “the difference is genetic” is … not that interesting discussion.
Meanwhile you do seem to be fixated on a concept of American exceptionalism. You believe that the American population is just very very different than comparably wealthy other countries, be they Canada, countries in the EU, or of the East. I have for many years served as part of our group’s QA apparatus and this is something I hear all the time when a doc has received poorer than average scores on some metric “my patients are different” … and when you look at the data closely they almost never are.
Is it, for example, true that “the sociocultural and lifestyle differences between Europeans and Americans are even greater than those between various groups of Americans”?
No. If anything the most significant difference between Europeans and Americans is that America has more internal divergence socioculturally with significantly greater income and wealth inequality than most of Europe. Our middle is smaller and top 1% and top 0.1% wealthier. Yes, overall we spend more and consistently save less. But saving variability within the United States is even greater and how to see what that factoid informs.
This thread was about the economics: we are simply not getting a great return on investment in healthcare spending. We spend more and have less to to show, at least to 2014, for it than a wide variety of other comparable countries.
Will, if supported, the ACA move that needle over time? I think so. IMHO.