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This is true. Bank roll management just lengthened your survivability rate since you can avoid improper increases of bet due to spur of the moment emotion. I usually set a huge bank roll when playing table games and stay on my normal base bet until I hit my lucky streak then leave. I usually stick to this strategy even if I’m losing at the start since there always a time that I can recover all my losses by continuing playing using same bet as long as I still have money to continue playing.
Still depends on preferences of the player. But bankroll proper management is real I'll important if the player wanted to last longer playing. Some people tend to YOLO, e.g, betting 25%, 50%,75%< or even 100% of their balance on a single bet. This kind of betting strategy is dangerous but if you're lucky, it's a great win.
It all boils down to the risk you're willing to take.