"Reduces stress: Deploying new code to production can be a stressful experience, especially if it's done at the end of the week. By following a "no deployments on Fridays" policy, teams can reduce their stress levels and focus on other tasks."

It would seem more valuable to instead put efforts to make code deploys less 'stressful'. If you are regularly deploying code and causing huge stress you are doing something else wrong. This reminds me of the old corporate 'you can wear jeans on Friday'. Somehow wearing them on Friday is ok, but the rest of the time will lead to dispair?