I have different point of view tbh, I will not focus on how much I may lose as well as the potential win but I'll focus more on how to manage my money.
Too much focus on how much you may lose will not good as it will bring negative mindset mindset and can be something stressful for some people.
If you focus on how much you will lose, that means you will focus on how to manage your money that you are using to gamble, having gambling budget and not using more than what you can afford to lose. So this makes me not to completely agrees with you. It is good to focus on how you can lose for you not to fall victim of gambling loss.
You are free to agree or disagree, we have our opinion for anything and I'm expressing my opinion based on my own experiences a gambler for years.
I was at the time when I focus only how much to lose, what did I get? I cant gambling relax as I'm worrying too much of losing although I had my own limit.
Once I lost then the regret I got is bigger when I'm focusing too much on how much I may lose.
That's why I said managing bankroll is better as it will cover almost everything (financially and mentality), and it will give me more fun while gambling instead of fear of losing.