The 30 hour mandate is from the federal government as part of the Affordable Care Act. If someone was moved from 40 hours to 29 hours because of this, that's bad, but they were likely not a union member, right? Unions would have a negotiated contract for however many hours they wanted (either more or less than the norm), and would have also already negotiated benefits on the side so the incentive for the employer to cut to 30 hours would be gone.

Regarding the fewer hours points - I wasn't advocating that shorter weeks are always better, but rather that unions are responsible for, or at least contributed to, many of the gains that workers got over the last 150 years, and that IMO have been eroding.

Pretending we lived in the early 20th century, isn't the benefit of 40 hours a week in a factory over >60 hours a week in a factory clear? In terms of health and safety, unions have also made sure that e.g. you were less likely to become trapped and burn alive during the workday [0].

[0] https://en.wikipedia.org/wiki/Triangle_Shirtwaist_Factory_fi...