What does you data show beyond a failure to relinquish all the memes?

This is naturally the default explanation that our society uses for such results, it seems plausible but why are we so quick and so confident to jump to it as the explanation? Do I even need to point out that other explanations seem just as plausible?

For example the model of attraction build by the PUA community predicts this result. Also basic economics suggests that if the partners specialize in task they are more productive, maybe we aren't seeing traditional marriage roles validated as much as economics. And why don't more traditional couples suffer more from residual patriarchal memes? Shouldn't the people in those relationship have even more of them than the society at large? Based on the evidence we are just as justified saying that they are happier because they have more patriarchal memes than the norm.