I'm not a fan of "breeds" exactly, because they were developed by the kennel clubs for dog shows and thats all they're good for.
But, before breeds, there was "types" that naturally came to be in accordance with the tasks man got dogs to do. Sighthounds, scenthounds, herders, mastiffs(bulldogs, boardogs, guard dogs, fighting dogs), terriers, etc.
The breeding selection wasn't so arbitrary as today and truely remarkable animals were being produced.
These dogs were better than wolves in their area of expertise, while the wolf is the original allrounder.
If our species was barely holding onto existence by a thread I'd be all for the allrounder type of human being the only one. But that's not the case now is it? If it was we'd naturally be being bred for exceptional allrounder traits by nature.
No, like domestic dogs, we're being kept alive rather than surviving. And so there is now a responsibility for our keeper, our keeper happens to be us so it's a strange situation. Society as a whole is keeping the individual humans.
Thus society is responsible for breeding humans in accordance with the demands of society. Culling strictly so we always have the best of the best, and only as many as we need. Reducing over consumption and making the human machine a neater little package rather than a big cancerous growth uncontrollably and relentlessly engulfing the planet.