I complete agree on that. I was NOT arguing against good education. Education (that gives you knowledge), love (that gives you mental well being) and good habits (that makes you more resilient) are going to have a huge impact in your physical, mental and economic well being.
> which translated in material affluence 25 years later on a different continent
Yes. And that's why emigration has a big impact in improving world-wide socio-economic mobility.
But suppose that you have started your live in an already rich country. In that case that country socio-economic mobility, by definition, is what gives you how dependent is your wealth on your parents wealth.
World wide socio-economic mobility probably is quite good. As it is easier and cheaper to emigrate than ever and also because there has been a lot of growth in non-western countries. But the article was talking about North America. And in that case, as it is also true on all western countries, mobility is shrinking. In that scenario education, love, good habits are still important for your well being. But they are not strong indicators of your absolute wealth.