They are penalizing the judges decisions, by making the DQ happen after the dogs have already won. Remember that the KC changed the breed standards after PDE for several breeds, but unless the judging actually supports those changes they will be moot. I think it's a public display by the KC that judges are expected to follow the edited standards rather than ignoring them (as most do, since many of the breeds that had the changes made were upset by them, and many of the breed judges are far from unbiased as they are also breeders).
Not all breeds are exaggerated, but they all have other issues (genetic disorders/diseases) that I think should be considered. I don't know how much a simple vet check would help with that.Isn't the point of this exam to keep exaggerated traits that cause problems minimal? So not all breeds have exaggerated traits. I don't show dogs, and I really don't know how this works. Do all dogs shown have to have health exams prior?