As sahm I do not in any way think myself to be superior to wohm. Or vice versa.
I made the choice to be sahm and am glad I did. I have a better degree than dh. I had what looks on paper to be a good career - London, arts, senior, publishing, writers, Groucho Club, well paid (in context), fantastic prospects, blah blah - but I didn't enjoy it. I was fed up to the back teeth with it but when I was pg I always thought I'd go back to it - how could I possibly give up the kind of job that an awful lot of people apply on spec to do for free?
But I did choose to give it up, and it was not a particularly difficult choice for me. (Thanks to dh earning £45,000 pa and our mortgage being about £600 per month, back then - comfortable, I know)
The truth of the matter is that I have a better future ahead of me now than I would have had if I'd stayed on that treadmill. I am no longer a wage slave and have gone off on a tangent which I doubt I would have done had I stayed in my old job.
Being sahm to my two dc has broadened my horizons, not curtailed them. I think it is inaccurate to suggest that a parent who puts their career on hold for a few years is as a matter of course written off for the future.