What do you mean? You just need to ban companies from doing 5 days work.

Amusingly, there is literally not even a 7 day work week ban for companies in the US. You can require employees work every day. Employers are just required to pay employees overtime under various conditions beyond 40 hours / five days a week, which is why you don't see it.

And what's more, software engineers are exempt from these rules because of their pay grades. If you're a SWE making a salary the odds are your employer could require you work on Saturdays without running afowl of labor laws.

This is all powered by norms.