Only half? My exp is more like 80% shack up with a breadwinner. Even with half of women that means max 25% of men get this option.
I mean if you go outside Western bubbles e.g. all of Asia Latam etc. 99% of women seek to marry a breadwinner over having their own career, closer to how it was 50 years ago here in the US, a dynamic that's hard to miss.
The 50% I mentioned is from a competitive ivy league school where you get a major career leg up. If 50% of female friends who went to an ivy have tapped out from career making, yes, it's easy to imagine how it's still the widespread norm even in US
I don't think most would say men have it equally available but I'd certainly say it's more available than it was in the past just like women having jobs that can allow them to be the primary breadwinner are much more prevalent in 2021 than it was in 1981.
I do know some male stay at home dads but not as many.