To get outside opinions on your dog(s) ... how they compare to the breed standard...they should be shown. That's the way you get various opinions from various judges.
If the dog gets it's CH, then that's better, but some show for a while, and do get points towards their CH, but never finish for one reason or another. Those reasons vary and can be due to the owner's inability to continue, or the dog got injured, or so many reasons. But if they've been out there, and have done well while they were being shown, then at least the breeder knows the dog does conform.
If you want a Newf that looks like and behaves like a Newf, then you need to research and find a reputable breeder who carefully plans his/her breedings.
The problem with many BYB's is that they breed indiscriminately, without researching pedigrees, and the resultant puppies aren't consistent in looks, health, longevity, working ability, temperament ... anything.
There's a lot more to breeding a quality dog than just throwing two AKC registered Newfs together and hoping for the best.
Two CH's can be bred and still not be a good match. Reputable breeders know the lines they're breeding, the health history of both, the genetics of both, and do their best to produce consistent quality Newfs.
I think most people who want to purchase a Newf want one that looks and acts like a Newf, and of course, is healthy. Nothing's guaranteed, no dog is perfect, but at least with a reputable breeder you have a pretty good chance of getting a good quality dog, whether it's a pet or a show dog.