Should the standard full-time workweek be cut to four days with no pay cut?

I work four tens in a hospital, and I am here to say the five-day office week is a habit, not a law of physics. The UK trial put 61 companies and nearly 3,000 workers on reduced hours for full pay, and the results embarrassed the skeptics: sick days fell by roughly two-thirds, burnout dropped, and most companies kept the schedule after the trial ended (results). Iceland ran the larger experiment years earlier with 2,500 public workers and found well-being rose while services held steady (Autonomy). We automated half the paperwork of 1990 and gave workers none of the dividend. A four-day week just collects it.