These are roles which in principle require you to abandon your private life and spend all your mental energy on the company.
Why do we even have these roles? Well, according to behavioural psychology males fight for status, and the ultimate sacrifice gives the ultimate status.
No wonder that no sane person wants a role like this.
What is holding these roles in place then? Well, I think the business sector and legislation is largely to blame.
Laws stipulate corporate structures, and business schools teach corporate structure perfectly in tune with the last industrial revolution.
If there is anything we can do to make the work environment more egalitarian, it's to change corporate structures and create roles which aren't unreasonable and/or customized to old-fashion gender roles.