While I agree with what you're saying in that I wish the Doberman were a healthier breed overall, I also want to point out that even though all these people are breeding Labs that live long and are generally healthy, they shouldn't be.
The question is, is the Labrador breed so healthy in spite of
or because of
all the bungling hobby breeders?
If the latter, there's a bit of a conundrum. It seems so wrong. I was mildly horrified when my sister kind of casually mentioned they'd bred their Lab bitch to one of her then-husband's hunting buddy's dogs, I know they didn't put much of any thought into that because they weren't at all passionate about their dogs in general. Somehow, that sort of thing works for that breed.
When I was seeking a Dobe puppy, I found it frustrating that almost all the breeders either seemed to be show breeders with bloodline myopia (inbreeding popular sires) or trashy, thug Greeders. It took me a little while to find a middle-ground breeder, the sort I refer to as a "farmer type". Just like a large middle class is the foundation for a stable nation, I think a breed becomes very stable when most of the breeders are in that middle ground.
I worked in a rural animal shelter in Eastern KY and I can say that most of the the dogs we got in were labs or some sort of lab mix. If someone were to come on here and ask about breeding labs (the fact that this is a Doberman forum, aside) the responses should still be much the same.
I think that's a rule in most shelters, because Labs are everywhere. They're dirt cheap, they generally don't become big disasters in the hands of novice dog owners, and it's hard to throw a stick in any dog park without having an intact & AKC-registered Lab pick it up.
No matter what dog you're breeding you should put time and effort into knowing all the ins and outs of the breed and dedicate a vast amount of time to learning everything you can about the breed before even thinking about breeding.
I'm not disagreeing, and I'd think that even with Labs, people are mostly in that mindset by their 3rd litter, if they get that far.
For example, you love Dobermans, or Labs, or whatever breed, so you get one. You fall in love with the breed so much that you get involved in working or showing, etc. Then as they years go on you learn what it takes to be the best of your chosen breed.
This is where I think the focus starts getting a bit too elitist, where you wind-up with very few midrange breeders. It's just not healthy to have a handful of elitist show/working breeders up high, a ton of pretty bad breeders who don't care at the bottom, and a lot of angst & resentment between those extremes.
A would-be breeder should be able to become familiarized with what's correct and what's incorrect/unacceptable in a breed, and be able to make a decent breeding decision without the lofty goals that would require making breeding dogs a life's work. It's just fine to have one's goal to be to produce quality animals that live-up to expectations by being perfectly average & mostly correct.
I think it bears repeating-- the next few dogs who earn the Ch or IPO titles to be considered the "best Doberman specimens" aren't going to get the breed out of the weeds. It'll take the overwhelming majority of the next thousand Doberman puppies who go to their new homes meeting expectations as protective snuggle-bugs who don't bring grief to their owners due to poor health, dying young, or having unsuitable temperaments.