Having this stuff makes you realize that trading is not always profitable.
Trading is very risky, that brings loss or profit at different time and to avoid complete loss of your capital, you must manage your capital in order to avoid complete loss of your capital after a few failed trades. Capital management is the most important thing to do in trading because it is prerequisite before you start trading.
In some other ways, this helps you see where there is a need to address improvement, but do we really think they are changing? No, they are still doing the same because we know that the market is unpredictable, and no matter how long we spend analyzing the results of our trades based on the records, it is still difficult to fix it.
People usually don't change themselves and if they can not change their bad capital management, they will lose all money someday. If they have good capital management, they can have failures in trading but won't lose all money they have. Then they will be able to learn and use better strategies for trading in future.
Strategies can be good and helpful but all strategies will fail at different times. By having good capital management, you will never lose all money when a strategy fails one or two times.