The percentage of single-earner households was also higher back then. Having a wife who handled the domestic front lessened the load on the people working demanding corporate jobs. Nowadays it's common for both of the couple to have that type of job.
And like, with all due respect, there were also a lot of mentally undemanding desk jobs back then. People got hired into them with just high school degrees. There are no "paper-pushers" anymore because there is no paper.
Subsistence farmers have never been prolific producers of art or literature. That kind of proves my point.