Lol, it's the first time I'm hearing the regret thing but it does make sense now when I think about it. Let's suppose Bitcoin is priced at $30k per piece, I gamble with Bitcoin and lose 0.5 BTC which at the time of gambling is worth $15k, but later when the price goes up to $60k, I'll remember that I've lost 0.5 BTC in gambling back in the day that would have been worth $30k if I had them with me right now. So you are basically right that one would regret it later.
Most people use stable coins because it becomes easier to keep a count of the money you are using, how much you've lost, and how much you've won only by looking at your balance when it isn't possible when you are using a cryptocurrency that has a value higher or lower than $1.
reading some of the statements this seems to be related to concerns when using coins other than stable coins.
let's try to change our mindset when using bitcoin to gamble, of course with a small amount and of course we will remember wisely to gamble using money that can afford to lose. so, if you gamble using money that you can afford to lose, why should you regret the money you've lost? sometimes we have to think realistically.
more precisely that's not the reason one choose stable coin to gamble but to avoid fluctuating crypto price. there is no reason someone uses a stable coin just to make it easier to calculate profits and losses because it will definitely cause regret.
regretting the money you have lost is just a waste.