Given women are usually called upon to take more time to do unpaid labor like child-rearing, elder care, and holiday preparation, the fact women choose a flexible schedule is a result of societal expectations, and should be ruled out as a causal link.

Because, on average, men are given a lot less social pressure to "be there", they can more often take high-pressure jobs. Then the high pressure becomes a status symbol, and a gate to keep people with higher social obligations out.

As this phenomenon also causes a ton of burnout and is a cause for men's shorter lifespans, the whole thing needs to be actively taken down.