Earlier quoted context omitted.
I'm gonna borrow OP's mindset for a second: Fuck this. In the United States the benefits of full time employment are mandatory if you want to live a much less stressful life. Tying benefits to employment has given employers far too much control over their employees lives, without a huge savings or secondary income source anyone without insurance is one bad day away from bankruptcy (and too many people /with/ benefits…
I agree with your sentiment regarding benefits in the U.S. Couldn't companies provide the important benefits (healthcare, 401k matching) to employees who worked a 4-day week as well? One potential issue is that I think there are fewer legal requirements, but competitive employers already provide benefits that exceed the legal minima.
This would also allow industry to focus on what industry does which is make money. They no longer would have to spend on expensive Cadillac health care plans in order to compete for employees. Governments job is to keep its populace safe and healthy, that is not the job of private industry.
The only reason we don't have this is due to lobbyists.