In fact, a gambler who cannot control his gambling process will not achieve long term success. Because when he loses bets repeatedly, he will control himself and stop betting. Some gamblers quit gambling altogether after winning a few times, thereby falling short of achieving long-term success.
So you are saying that someone with no self control and gamble excessively would not achieve long term success because he will always lose but someone with too much control will also not achieve long term success because he would not achieve his maximum potential when it comes to gambling. That is a pretty tough line to stay in between in. To me as long as you have won and taken profit then that is enough of a success to me.
There's nothing wrong with trying to be disciplined so it's actually better to limit the amount of bets or allocations we pay so we don't go overboard.
I understand that being too scared to bet would not lead to any profit but also being too reckless would not give any profit hence why having a balance would be the ideal situation. Set a budget to not go overboard on and to keep you on track but gambling will always be risky and you can never do anything to make it completely safe so might as well just try to bet the most you can within your budget.