Overtime hours apply only to hourly and non-exempt employees today and only for hours over 40. Thus a change to the work week might start with a cap on salaried employees hours and required overtime for hours over 40. With fewer exceptions would a 4 day work week might result from working 4 10's first. If overtime is set at 32 hours as well this would push down hours per day. I can't foresee a cap on hours per day so this could be instituted by companies requiring 4 days in office.
If the U.S. with a mine to universal healthcare I'm worried the wage decline would happen naturally anyway. However that may lead to more flexibility in hours with companies opting to allow more control over number of hours as extra costs more scale more slowly
So long as the value they provide is greater than their cost, the deal is good for both parties
Ideally people would only work 30 hours but get paid for the full week.
Hourly billing is bullshit anyway. The natural cadence of work doesn't map to always being able to extract value from every single hour. Sometimes the value is in being more or less available for that week.
It's astonishing how many developers can't grasp that concept and insist on being super strict about hourly work
No comment on your assumption that I'm a developer unless you meant it as a standalone fact.
This has to be tightly regulated if not it will regress and only profit making will be optimized.