I read and learn. I do not breed, but I hold a special place in my heart for those who do. I am however, a mom, so I am going to use an analogy here that might hopefully explain some of the feelings here.
There is always new research that says, "Good moms do this." or "Good moms do that." and then 20 or so years down the road we find out that it was wrong.
When I had my first child 24 years ago, it was the 'correct' thing to not circumcise baby boys. The research was showing it as unnecessary. Now we find all sorts of issues with little boys who were not circumcised.
We were also told not to start babies on solid food too soon. To introduce food slowly and in isolation. To buy prepared baby food instead of homemade because it was less likely to be contaminated. T
he vaccination schedule is different now. I even had a doctor prescribe peragoric drops for a baby with 'colic' only to find out it had opium in it!
I believe that blanket statements such as...Good moms do this.... or Good breeders do that... is overly simplistic and counterproductive.
Every child is different and every yorkie and yorkie litter is different.
Sometimes we know the current research, but choose to go with our instincts instead. Can that really be justified? No. Does it happen? Yes. Should we always go with what the research says? I don't think so. I think each of us should do what we think is best in our heart of hearts, and we should NOT be judged for that.