The 4-day work week is the headline, but I suspect the main productivity gains came from halving meeting times to 30 mins, limiting attendees to 5 people (with single representatives for each team), and encouraging chat for collaboration:
"Microsoft Japan Says 4-Day Workweek Boosted Workers' Productivity By 40%" https://n.pr/2qqT8m3
Another interesting statement was, "Younger people actually choose work flexibility over health care coverage, even though that expense in America is pretty high," Schawbel says.
The conclusion is specious. Typically young people don't have much health care costs, especially when they don't have dependents.