[vcjohnson]

For what it's worth, the stuff I've read on societies that flatten our social pressures for job roles, specifically the most egalitarian societies like in Scandinavia, have larger exaggerations of traditional job preference for the sexes rather than more equal distribution.

I don't think it's clear why both of these occur however and I haven't been convinced that people who try to derive a position solely off societal level trends tend to do anything other than show off their ideological preference on both ends of the debate.