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The gambler will know that in gambling, there will be a lot of temptation and if he does not have good self-control, he will be easily tempted and ultimately will not be able to stop gambling. That's why he wants to learn self-control so that it can help him stay aware that in gambling, he doesn't need to use a lot of money to prevent big losses. He will also always limit himself in gambling by obeying these limits and always stopping on time.
yep, the most important thing is knowing when to quit and all of that requires commitment and good enough self control to be able to obey your own rules and there are many gamblers who can bet healthily without chasing losses with good enough control but all of that requires struggle which is quite strong because as you and others have said with gambling there are always situations that can cause emotions to take over our minds and we lose control.