I saw a boxer interview recently , the boxer could not stop hurting his opponent , he was not aware that he had become emotionally hijacked , his desire was to protect himself but the only way , to do it was to finish his opponent ad by hurting him to animal standards
You will understand this analogy and how it relates to trading , when traders are under stress , this can only be tested on live accounts , they try to protect themselves and losing streaks on accounts , with revenge trades etc
Most traders trade their emotions , the minute they open the screens , their emotional brain calls all the shots and traders can become undisciplined .
This is where coaches are useful , for maintaining discipline and emotional regulation.