I'm a SAHP with a high earning DH, gave up the professional career etc, the kind of person who some on this thread would despise.
I did go back after DC1 and attempted to juggle my job working part time but soon realised that it wasn't doable. Mine was the kind of full on job that involved 12 hour days, even leaving at 7 at night you'd feel as if you were barely coping. Having to leave at 5 to get to the childminder in time for pick up just made the situation untenable. And yes, I could have extended the childcare and done those long days 5 days a week. But for us that wouldn't have been the right decision as a family.
I do lots of voluntary work instead, stuff for the DC's schools, church, scout group, local charities. Stuff that engages my brain professionally, stuff I enjoy, stuff that is, I would hope, 'contributing to society'. I just don't get paid for any of it.
I don't in any way see DH's professional achievements as mine. And I do agree with those who say all the pressure is on him to be the earner (though he genuinely doesn't seem bothered by this), and I do accept that not working puts me in a more vulnerable position financially (though we have taken steps to ensure I am fairly financially secure in my own right).
But I don't agree that I'm a useless waste of professional talent and of no use to society.