
Well at least the Kennel club are happy to accept dogs onto their register who come from a bona-fide breed registry, so their really is not an issue.
The Kennel club are a multibreed/all breed registry where the ISDS are a breed/working dog registry, akin to a breed club.
As I understood it the Border collie was already a show dog in other countries before KC recognition, and the situation could not remain unresolved, as it would have been possible that showring enthusiasts would have brought these dogs in, and they could not have them as a foreign rare breed in their country of origin.
I do feel it is a bit strange for ISDS people to criticise KC bench dogs and breeders yet not have their dogs used to improve the breed if the dogs are better/more correct. It is fortunate the KC do allow any ISDS dog to come on it's register for the good of the breed, albeit as a show and sports dog rather than purely a sheepdog.
Each to their own, and at least the situation is better than is some other breeds where the working dogs are very different from the show, and very few of the working side take part in health testing.
As for the third group of Non KC or ISDS registered BC/WSD dogs registered on Activities register, the situation is similar with low uptake of health tests.
The Activity register was never really designed for breeding, and to breed and register puppies on it does cause confusion. It could, and I am sure sometimes has been used in order to register dogs and pups that can't legitimately be registered on the breed register, in order that the dog has more perceived value with 'papers'.