This kind of confirms a hunch I have which is that macro social beliefs change faster than corporate cultures. So a society as a whole might decide "men and women can work wherever they want" and start to teach children these values, but that doesn't mean the employees at a law or accounting firm are going to change their behaviors (not to mention their policies) at the same rate.

My father was a postal worker and described to me the process that the USPS used to improve their culture, and it involved new policies, procedures, and training for all employees.