Underestimating management is something bad. In my opinion, bankroll management is a good thing to be controlled and able to research when the game is not good. There are times when the game is not good for betting. I'm sure everyone needs a bankroll. If you gamble without using a bankroll, I think you will lose your money quickly because you don't set aside money. If you still have the money when you lose, you can play tomorrow, you don't have to win now. Maybe people who don't use a bankroll will lose their money faster