However, there is another kind of danger with bankroll. The danger of overestimating the role of bankroll in making a profit. In fact, it is a very simple thing: bankroll allows us to lose money less quickly, but no matter how well we manage our bankroll, it will not allow us to make money. In other words, bankroll management can allow us to lose money slowly, but it knows nothing about making money.
Bankroll management was never meant to make profit.. As you've said, it only reduces the risk of losing money fast. It teaches us to be disciplined with our bets and not be greedy trying to go all-in and think that we will hit the jackpot.
Bankroll management is an important skill to have in gambling if we want to be profitable. Profit will follow if we know how to diversify our bets for higher chance of winning.