So who does the work at home now? Both partners after they get home from work? That doesn't sound like a better deal to me.
[1]: https://eh.net/encyclopedia/hours-of-work-in-u-s-history/
Also, less work being done at home isn't necessarily a good thing. More people eating microwaved ready meals or takeaways probably means lower quality of life overall.
I've got no other points to defend. But I'm happy to look at any of your points, and I understand and accept the argument that hours of leisure time is not a direct measurement of well-being. (: