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In my opinion, you should make your own decision whether to quit playing slots because it depends on what your goals are. Losing is a natural outcome of a gambling session, so it can not be a driver for a decision. The only thing I would advise you is to learn to limit your deposit and end the gambling session after you have increased your bankroll by 20-30%. In this case you would lose much less, or even win if you exit in time.
Yes, I agree with your idea that actually defeat is not a situation that can encourage a gambler to make a decision, especially one that leads to various actions that tend to be impulsive due to the inability to accept risks, stopping at the right time will always be the best, but it's all up to you, as long as you can control yourself and only deposit a small amount without any increased emotions in the situation such as a losing situation, then please continue if you want, but of course while maintaining your awareness so that everything can remain measurable. Basically, all forms of prevention are the best, especially in an activity that has the potential to trigger significant risks, and overall I believe that all forms of prevention will most likely only be able to be done by gamblers who are aware from the start of the dangers of the impact of the activity.