I think the problem is that there's more to DM than clear, carrier, or affected.
There is a factor X still unknown, because even dogs that test affected may not ever show any physical symptoms of DM. And wouldn't those dogs be OK to breed, especially in a breed without large numbers?
I agree that more research needs to be done regarding DM.
And GSD breeders rarely test for DM because it's so prevalent, if they were to only breed their clears or carriers it may very well wipe out lines that took them years to found. Kinda like how it's basically impossible to ask that Doberman breeders only breed vWD clear dogs when something like 60% of Dobes are said to be at the very least carriers.
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