In gambling in general and in sports betting in particular, bankroll management is very important. It is really important because it helps to avoid financial disaster. But if you play not only for fun and thrills, then we should also remember about strategy. Many people implicitly try to replace strategy with bankroll management. But I think you will agree with me. We forget about strategies all the time. Bankroll management is not a strategy. Bankroll management only helps you not to lose your bankroll immediately. You will lose your bankroll gradually, slowly, but still you will not avoid losing your entire bankroll, because most likely you do not want to know anything about strategies or even replace them with bankroll management.
Do you agree with me? Or do you think that bankroll management is a strategy?
You are absolutely correct, bankroll management is not strategy, a strategy involves making a well informed decisions about which bets to place, etc. But bankroll helps one to preserve their funds, just as you have highlighted, gradually your funds will reduce but it can be spent entirely, because of your determination and discipline to focus on using funds without exceeding your budget.
And also, this helps one to be able to gamble or bet responsibly.