I think that having a positive mindset is keeping us composed when we gamble. Even on the bad days, it keep us on shape and won't make our approach towards gambling to become more aggressive. I agree that positive mindset is not enough for us to win our bets but some certain strategies depending on the games that we're playing. But one thing that we have to appreciate having a good or positive mindset is making us calm at most times.
Aside from gambling, we should all carry along with us a positive mindset. It helps us see the world differently and react to things in a way that they do not get to us. And in gambling, it amplifies everything. One of the ways that a positive mindset works in gambling is that it could keep you from overshooting your bankroll. No winning is promised but with a positive mindset, you will comfort you after the loss.
Yeah, there are downsides of it as well just like what others are saying. But always look at the positive mindset that it will give you a clear mind as you gamble and you'll also be able to determine what's right and wrong with whichever situation that you're hitting in when you gamble. It's quite hard for someone to keep that positive mindset to themselves because they'll reason out that they become overconfident that they'd win and so, it tends out that they continue to gamble instead of stopping. While that can be valid but we all grown up to determine what's the proper way of addressing our own approach.