[technick]

I guess this makes sense if you also consider the history of dog breeding. The best traits are always breed forward into future generations, those characteristics could be how athletic the dog is or how friendly the dog is.

[jibal]

You're talking about traits passed via DNA, which is nothing new ... this is quite different.

[wakawaka28]

From the perspective of an individual breeder, they cannot know how much of a trait is from DNA or not. It may be more likely to be DNA-driven if you can prove that the trait is durable over many generations, in different environments. At least, that is my guess.