You are just stating here what I have seen stated a multitude of times by LOTS of breeders. I was addressing the STATEMENT of "breeding to improve the breed".
Second, because we all have our own goals, that is what we (breeders) breed for. Its VERY subjective because we have no "objective" body to govern breeding. And then in order to "maintain objectiveness" we'd have to have the "policing the police" system for checks and balances.
In my OPINION, breeding a dog AFFECTED by a polygenetic disease, it not only NO "bettering the breed" its also NOT "doing no harm".....
Something that is a simple recessive, I agree with you that if the individual was that spectacular, then you could incorporate it into the breeding program with the idea you could breed out the undesired gene within two generations.