Basically it's because the breed is still in it's formation. It's been going about 15 years, but if you consider that in terms of dog generations it isn't so long. We don't feel we have a broad enough gene pool to completely rule out breeding from dogs with soft ears or curly tails, as long as they are healthy, of good temperament, etc. Cosmetic faults can be bred out, though obviously the long term aim is to not have to resort to using 'less than perfect' dogs for breeding.