Reproduction and evolutionary success in breeding conditions are not the same thing as survival. No breeder kills off dogs with unwanted characteristics, they just don’t breed them.
I learned that when I met such a dog the first time some years ago and the owner told me about this. And I would not bet that it actually is "history" nowadays.
I sadly have to disagree as history tells us a different story, e.g.
"Back in the day, puppies without a ridge were either euthanized or culled at birth." https://healthyhomemadedogtreats.com/ridgeless-rhodesian-rid...
I learned that when I met such a dog the first time some years ago and the owner told me about this. And I would not bet that it actually is "history" nowadays.