That is interesting, thank you for sharing. Unfortunately I think repeating with zen monks is necessary because the effect is dependent upon the amount of focus given to the task. A person who is not a zen monk is not only "untrained", but also has their mind assailed by Tiktok, video games, phone apps, TV...each of these things retards the focus by training the brain to expect high reward with low effort. Therefore, I am not surprised at the large difference between said person and someone who spends their life meditating.