Earlier quoted context omitted.
That sounds identical to the opening chapter of Malcolm Gladwell's book Outliers! [1] 'What Wolf slowly realized was that the secret of Roseto wasn't diet or exercise or genes or the region where Roseto was situated. It had to be the Roseto itself. As Bruhn and Wolf walked around the town, they began to realize why. They looked at how the Rosetans visited each other, stopping to chat with each other in Italian on the…
http://en.wikipedia.org/wiki/Roseto_effect Wow, that is patriarchal oppression and stifling familial roles.
Oppression and stifling social norms cause the very same stress that these guys appear to have managed to avoid. It appears that they've found their own norms that, to a naive observer, look stifling or oppressive, when the net effect is that the average level of social comfort actually increases. Call it "traditional gender roles" or "acceptance of social inequality" if that fits your particular bias, but you cannot take such a value judgement and call it "oppression".