A good temperament (what is that?) is of course a part inte it, but also a good conformation and soundness. I am going more in detail in those different traits and what I like in other posts. I got the reason I think those things mater from the human world. (I rarely make that kind of paralleles, but here I find it valid). If a human finds it easy to play basketball, maybe I am taller tahn all others, I easily think that I am good. The trainer probably accnoledge me and praise me. That probably leads to a positive trend where I try harder and harder and feel good about it and get positive feedback.
I think animals work in the same way, if you find something the animal (horse in this case) finds simple and praise that it probably going to like it and like to continue to work with it. The trainer is probably going to like the horse and tell it that it is good when it tries and that way start a positive way. Both trainer and horse is going to show there best sides as they have so fun togheter. Of course a good trainer understands if he askes for something hard, knows the thin lines between ok and when it is not, notice those small differences and is good at explaining. but not all are as good trainers, have the experiance or the aiming to do everything in the fastes way. Therefore I want to breed a horse that find most basics easy, the ones that most equestrian sports build onto. It might not give you a horse for the elite, just as find it easy to play with a lball don’t make you a succesfull basketball player. But, you might learn the basics easyly. that way it is not always that what is a good conformation for one sport is that for another.
To be healthy then? Or soundness as I see it at horses. In one part I find it boring to visit the vet all the time, to rehabilitate, work the horses slowly over and over again. And it is not cheap. Another reason for health is that if you are in pain you might not be at your best. If everything always needs to be special and very careful.
To specify all preferred traits may not be easy – to find individuals that live up to all of them even harder. Maybe even harder even if you have a lot of money. No-one is perfect. Therein lies the charm about it; to find what is good enough, calculates risks and to find good matches. To choose individuals, even if not perfect. To sometimes evaluate ones believes and keep updated on what is happening in the world, both within the breed and science.