Even if everything is really uncertain its more better for gamblers to do somethings that can improve their gameplay since playing without doing anything is so boring and we might not gonna enjoy what we are betting or playing.
Using those things that can help us somehow increase our chance to win although everything is unsure but for sure those methods we learn thru experience and somewhere is else is somehow helpful to us. I'm not a fan on relying to much on luck like we didn't do anything for believing that everything goes out base on luck we get since for me I think I will lose more if that situation came up on my mind. That's why sometimes I do martingale and do a lot more research since somehow by doing this I enjoy gambling more by doing those set up.
A lot of people i know in real life gamble a lot, even when they're just bored or when they no longer see where it's all leading. To create a proper plan, you first need to decide how much money you're willing to lose. I agree that having a plan is basically the most important thing, but luck also plays a big role in all of it. Some people rely only on luck, without having any kind of plan beforehand.Sometimes luck does favor the brave and those who take risks, but like i said without a plan, there’s no big win either.
Somehow what you have stated have sense since after all luck play huge factor towards the result we are getting. But we can say that everything is situational since we cannot get consistent result on gambling.
That's why as you said we need to decide on how much money we can afford to lose then stick to that amount or never tried to exceed with it. Since if the gamblers try to go up on his allocated budget intended for gambling then there's instances that they might experience those worse situation that they are not ready to face.
Planning is important because with this we provably aware or know what's best action if there's situation that need to have an immediate decision.
Some maybe have courage to risk a lot but make sure that they are spending is the amount they can afford to let go. Since its disappointing if the placed amount is everything or their hard earned money which they can't afford to let go.