It is easier to pull the blind mask of " no trading psychology is involved in trading " , on all the blind noobs. The psychology module , I suspect , is equivalent to the dumb guide to psychology , as practiced by those who can't.
Professional traders understand the reasons for having a position on, actual reasons based upon their own forecasts and ideas. If the trade goes wrong, they don't need specialist physiological training to know well ****, I guess my reasoning was wrong and I should cut the trade.
Traders like you don't have the same understanding or investment process. You're relying upon some patterns or lines drawn on a chart. When trades go wrong for you, then you have no genuine idea why, is it just part of the strategy, is it the broker, does the line not work anymore, are the market conditions wrong, is the strategy not working, are algorithms exploiting me, questions questions and more questions. That uncertainty arises because you haven't done proper work before putting the trade on. You've done the work months or years before trying to develop a rinse and repeat system that you want to use forever to make easy money for the rest of your life. So that's the truth, why retail traders are so obsessed with psychology, you need it to prevent you feeling all of that very justified uncertainty after each loss and completely wrecking your account.
For the broker, they're laughing because your psychology desensitizes you to losses and makes you the perfect client. For a professional trader, they'd literally laugh at you too for the way you hold up psychology as something that affects trading.