I played 23 games 20 minutes games (12 hours) in a row against one of the best in the club at the time I was in a club. He would never allow take backs he wanted me to learn to think before moving. I only won 3 games out of 23.
I think learning this lesson is important as in tournaments you get no take back option.
I am patronising enough to let people take back and arrogant enough to believe it makes no difference.