The issue is more nuanced than that I think. Take the tech consulting industry as an example: many men work long hours here because they heel pressure from higher-ups to do so, but the truth is that their marginal productivity at hour 55+ is almost zero. This results in higher pay, but in truth most men, even in high stress jobs such as tech consulting, could finish their work in 45 hour weeks. They stick around because of the social construct that men working exceptionally long hours is something of a badge of honor and respect in that world.

Now take a woman in the same job - there is still a bit of sexism inherent in that world, especially with older managers, and it's not considered "appropriate" to pressure women into working 60, 70 hour weeks because she has kids, etc. This is reflected in the average pay - women who work the extreme number of hours make the same, but most women are never invited to that club. In truth, some of that sexism is justified, because it doesn't make complete financial sense to put a female consultant on your biggest clients if she's going to take three months off for maternity leave.

So what if we put certain overtime laws in place, even for exempt employees, after about 50+ hours per week? I have a strong feeling that men would no longer be pressured to work extreme amounts of hours for no reason, but I doubt their pay would decrease because most top consultants are truly hard to replace. Those who actually have crunch time and are not killing hours for appearances will be paid more, which they deserve.

The next step is legally mandated paternity leave, or at least legally mandated flex or part time for new fathers. Men deserve to be allowed to spend time with their kids too, and implementing this would be good for both men and women, allowing couples to choose which parent dedicates more of their time to work rather than de facto choosing the wife.

I think both of these things would fix the mythical wage gap in just several years. Instead I think conservative outlets like the WSJ (rightfully) argue that men get paid more than women because they work longer hours and don't take paternity leave, so that we don't realize that it's much harder for men to demand fair working hours and paternity leave.