Economically speaking, I suspect this is more to do with the superior position of women, as a class, in setting the standards of what an acceptable relationship looks like.
If husbands are willing to do heavy lifting, wives would be economically irrational to do their own heavy lifting. I'm pretty suspicious that the deal offered to a housewife comes with better quality of life outcomes than the deal offered to most engineers. I've always assumed it is linked to the relative excess of young men to the number of young women (something like 107:100 or close to [1]).
It makes sense to me that the group with most power in establishing a relationship would choose not to be an engineer if they could be, say, mind the house.