There are of course exceptions. I didn’t mean people shouldn’t adopt from shelters, or that adopted rabbits are less healthy (it’s just my experience), but I just wanted to point out that there are also other options, such as breeders, and that there are responsible ones, as you said. There are, however, also bad animal shelters.
Responsible breeders also have their rabbits vaccinated and checked by vets and tell if the rabbit has any disorder or problem. Since they are also experienced with the breed and have older and very old rabbits, they can point out to potential health problems that might occur later or to an increased susceptibility of his rabbits for a specific disorder at a certain age.
They also offer older rabbits with established personalities, not only young ones, and can predict how the young will behave depending on their parents. There are even breeders that focus on temperament to produce better pets.
I’m not a breeder and I’m not writing this to support or oppose any side, it’s just my own experience and observation.