I think it is true the more you know the harder it is
! There is also a quotient of mystery in a breeding no matter how careful, and the simple fact that dogs are living beings and even that goldens have many health risks. Even in a gorgeous well-thought out breeding, maybe there are no show pups or maybe the fire is there on paper but no FCs.
I had a golden who should not have had severe ED. Her parents, grandparents, and greats had nice clearances, but several descending in her litter and her cousins and nephews etc had it, and her mom was eventually spayed. Frustrating for everyone- as truly all was contientious and careful, but they still had it.
On the flipside, people argue on behalf of backyard breeders bc by the coin toss they have a healthy dog- just lucked out and then they generalize that.
In response though to the above post that the more we know the harder it can be to pull the trigger and choose a pup or stud dog, I think it helps to make peace with the idea there is going to be risk, but usually if a dog doesnt pass a clearance or has an issue, it isnt life threatening( it can be) and a new normal comes, maybe with reigned in hopes for the dog, but still a loved and loving life.
My golden Finn had prelims Hips excellent elbows normal, eyes and heart both clear. His mom lived to be 15 and his dad started his Master Hunter title at age 9 and finished at age 10. Finn has idiopathic epilepsy, and his great, great,great grandfather had it too severely. When Finn was diagnosed, it was like the world was ending I was so panicked. Over time though, it normalized, we learned to deal very nicely with it, and Finn is doing amazing as an active happy veteran. I would rather have Finn with his epilepsy, than another dog without it. Finn didnt win in the genetic roulette, but the great majority of the dogs in his "line" are healthy and longlived, so I made peace that everyone did their bests, but Finn still has this problem that represents the vast minority and a kind of unlikely wildcard. He still the bestest dog.