Every "smart" gambler should know the basics of bankroll management unless they really dont care if they win or loose. I have spent a lot of time on gambling sites and it seems that most players have no idea what it means or dont have the patience and discipline to follow the simple steps. The points you mentioned are all valid and its the only "safe" way to play. Still sometimes the "Yolo" approach is better, just let it ride and see where it takes you, all about how one likes to play.
Ofcourse it is nice to do the Yolo approach every now and then, but you want to avoid this when playing for serious coin. Bankroll management is mainly for people that are serious gamblers and want to be able to keep going for as long as possible without going bust. They want to lower the risk by reducing the potential reward, but making sure variance will never get to you. You need to really want to become in control before you can implement a system like this, as it takes effot and discipline.
I like to suggest JetWin as a Bitcoin casino/sportbook:
You can set max weekly spending/loosing limits: so your bank management is fully automated!
Not really. That only protects you from betting your entire bankroll in one go. It does make you bet the same sized bets all the time, or if you set it to 20% you can still bet more than your maximum of 1-2% per bet. This is something you have to do for yourself.
If you gamble you are greedy, so just fck the strategies. Take what you can lose, make a single bet. If you are really lucky you will win, otherwise you will lose and then go home.
That's a massive generalization. With this attitude you will always be a loser. After winning that single bet you probably place a second and a third untill you lose it all.