
The way I understand breed standards, they should represent the ideal in looks temperament, and working/Mental abilities, based on the purpose of the breed.
Obviously some aspects are open to Opinion.
In the showring only the physical attributes, and to a certain extent temperament can be ascertained by a physical examination, and soundness of body when having the dog move.
In the working Arena, I would guess that some breeders do not care one jot what the dog looks like, as long as it could work, and for those doing trials, work at the highest level.
In my breed in Scandinavia a working elkhound and a show one are one and the same. The keen sportsman cannot make his dog a hunting champion unless it conforms to the breed standard markedly in looks and temperament. It has to gain a First Quality grading at a show, in order to get its working tiltle. the same goes for show dogs, they must prove themselves in the field also, before they can be awarded champion qualifying awards, and if the best dog does not have his hunting Qualification, then the CC goes to the highest placed dog.bitch that does.
For the purist this is all quite correct, but as a result of this my breed lost a lot of fanciers who are not primarily interested in hunting but showing and breeding.
One can see what happened in America (less so here) for example, where the breed was developed into a glamourous dog, many oversize, and early maturing, resulting in overdone at maturity. Breeders have worked hard to correct this exageration, and the standard calls for a dog that is not cumbersome, so it can do a days work.
I would imagine that the ideal Labrador lies somewhere between the show and working type, and there are undoubtedly handsome working labs, that wouldn't be disgraced in the showring, and show dogs of a suitable build to work. Both extremes are incorrect.