I'm one of those!
When the DC were tiny DH and I both worked and were middle-ranking. In my job a job could suddenly develop complications and require us to continue working into the night with no notice. DH's job would have a problem develop abroad requiring someone with his specialised expertise and the 'clout' of being reasonably senior in the Head Office to go to where the problem was. Usually the local staff had done their best to sort it out and the need for extra input would become apparent very suddenly.
For either job refusal to stay on or go away as necessary was resentfully accepted on one or two occasions, but any more than that and the employee's committment to the job was doubted and remembered when the time came for promotion or offering a more interesting and demanding project, which would, over time, lead to career progression.
It became clear that the day was going to come when I would be most unpopular by refusing to stay late again at the same time as DH would make himself unpopular by refusing to leave the country at short notice again and that would lead to tensions between us as well as at work. We talked it over. One solution would be live-in childcare, which would mean moving house as well, to accommodate that. I decided that in order to have the life I wanted: no hard-to-resolve clashes between us, no regular fights about whose job was more important, no fights about who could take time off when the childcare failed, one or other of the children's parents being present most of the time, one person, rather than several being on top of all the domestic arrangements and so on, I would give up my job.
DH was fully aware of the sacrifice I was making career-wise and how smoothly home ran when it was clear with whom the buck always stopped for all things home and child related. But it was quite clear, too, that being the person who could always step up for the overnight flight to somewhere-I'd-never-heard of with 2 hours notice, and no 'having to see what DW says' or 'making childcare arrangements' or even 'if I do this, can I have time off for that', did his career no harm at all. He became the go-to person to sort out all sorts of problems, which increased his expertise.
Meanwhile, rather than lunch and talk about home decor, I threw myself into a new 'career', volunteering. I started with helping out at playgroups, then nursery, then school, then moved into various organisations in the community. I didn't return to paid work, which made life very easy every time something needed sorting out even when the DC were at secondary school. But I did develop expertise in a whole variety of different fields and came to know a large number of people locally. I think my horizons were far broader than they would have been had I just been working in my original field. And both DH and I knew that we were both making different, but valuable contributions to the family and the incoming money was due equally to both of us.