The goal is to keep expanding these trials until labor law ratchets the work week down for everyone to 4 days. It will take time, but it will happen.
If you as a freelancer want to work five days a week (or more), by all means, spend your life in such a manner. The rest of us work to live, not live to work.
Laws mostly do not apply across borders, and many of your competitors are in other countries. How do you think you can compete if your competitor's employees work 25% more?
You disadvantage foreign firms with cross border financial/policy mechanisms, in the same way you encourage better labor and environmental practices for work outsourced abroad. This is a well worn policy path.
A race to the bottom can avoided with laws and regulation.
