I didn’t interpret that as “there is not a person who has discovered 4x10” but rather that there aren’t notable companies making it their official schedule.
Last time Lockheed Martin reached out that was one of their selling points.
When I worked for Northrop, they offered a "9/80” schedule. Every pay period, you would work 80 hours in 9 days. Monday thru Thursday, you would work an additional hour (so 9 total), then have every other Friday off.
I never did this personally, but I worked with civilians that did 9 80s. If management isn't willing to consider "exotic" schedules, 9 80s seem like a really good starting point and a pretty sweet deal