If this was truly the case we'd probably see massive differences between countries depending on latitude, no? And yet life expectancy is strongly correlated with gdp per capita.
https://ourworldindata.org/grapher/life-expectancy-vs-gdp-pe...
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One variable doesn't necessarily overwhelm others. That's why multivariate analysis is needed; but humans introduce SO MANY variables that it's difficult to even enter them all.