Another thing regarding the OP's last paragraph. There is a mysterious correlation between mind and body. Why do chess pros work out?!? Why do you think that physical fitness does matter? Have you ever done exercises before sitting an hours' long exam? (Or not)?
Leading a balanced life would also help with chess.
Someone playing Blitz or Bullet chess will have a lot going on "up there" and hand coordination is part of the whole thing.
Closing, have you noticed the issue kids have with their concentration? Well, I've seen them focus on chess games for a looong time. Beat that!
Well, one of the challenges in life is the need to constantly adapt and adjust. Then there are folks like me who are bad at problem solving in different situations. Bad at prioritizing. You get the drift...
There are some principles which will help chess players when they apply those to real world issues. Take the importance of TIME. Fast and accurate decision making leads to fortune. OTOH, I have watches an old man at a tournament who wouldn't do a move wile time was running out. Any move! We all know those people - they miss out on life's opportunities.
Ironically, I felt like giving up chess when I once again blundered only yesterday. But pain is part of life and maybe our defeats are more important than shallow victories?
Take cheating. I can't see a point in that TBH. Even if I had a wonderful engine at my disposal, it would detract from the essence of self improvement. Or the all important TRYING to accomplish something -vs- being n e g a t i v e and defeatist and finding excuses for beling a lazy slob. Passively watching TV all day long? Are you sure that's the future you choose for yourself?