You are right, and I do agree with you, it is always better to hold bitcoin and gamble with either Altcoin or stable coin, but the best (for me) for gambling is stable coin, like I have explained before in an earlier comment on this thread, stable coins are more stable in their price, so let assume one gambles with $100 in stable coin and loose it, the chances are very high that even in the next 10 years coming, that $100 loss will still be valued at $100.
But let's assume you Gamble with $100 worth of bitcoin today, and lost it, then like we have seen, the chances are very high that in the coming 5 years, that $100 worth of bitcoin that was lost will be now valued at $1000 dollars, because the price of 1 bitcoin has risen so much.
So, for me, stable coins remains my only currency for gambling on cryptocurrency casinos, and when it come to local casinos where I get another option for payment, I will gamble using my local currency.
In fact, if you lose $100 today, in ten years those $100 won't even be equal to themselves, and in fact that future loss will be even smaller, since the purchasing power of $100 in ten years will be significantly lower than it is today. So losing $100 today is not the same as losing it in ten years. It's better to lose $100 in ten years than to lose it today) But it will be even better not to lose those $ 100 equivalent in BTC. Because in 10 years this BTC amount will cost definitely more than $ 100.