Points taken. However working 60-80 hours a week is not sustainble for an indefinite period of time. Even though we know that the professions mentioned above require over 40 hour weeks, just to be conservative:
40 hours at the job plus 20 hours at home is not easy. I can understand why many women have to work for financial reasons where both incomes are needed to maintain certain lifestyle, but not when the option is availble for the wife to stay at home.
You can not deny that it is significantly more difficult for women to maintain both career and kids.