It's better to have that limitation and also have that courage to tell yourself that you are already good with your sessions, whatever the outcome.
A practice that everyone should learn and used to avoid gambling addictions that can lead to worse things to happen in life.
That's what a gambler must have so he doesn't experience big losses. But unfortunately, not many can apply this when they gamble or some of them can apply it but after a few rounds, they become so passionate about winning that they forget about it.
In practice, it would not be easy to learn and maintain because, in gambling, one's emotions could escalate easily. This can make him let go of those restrictions slowly and in the end, he uses no restrictions on gambling.
It should be noted that those gamblers who can apply this are gamblers who have experienced so many bitter experiences that they can always think about risks and prioritize how not to lose more money.
The majority of gamblers who don't apply this method are novice gamblers or gamblers who only pursue victory, but I'm sure from time to time they will come to their senses.
It is true what you said that in practice it will not be easy, especially if the added emotion arises, it can be more difficult to have predetermined boundaries.
Especially if that person cannot control his emotions and when he loses, he will become even more eager to recover from his defeat. If this had happened to us, we would surely be very sorry that we have lost much money at gambling. And we won't be able to get it back even if we have to use other money.