I think the full tail is indeed quite beautiful
that said, part of having a breed standard is having a consistent 'look'. while i don't want to devalue any other dog and their wonderful personality- even if they don't have the look I like- there is definitely a preference I have for my dog.
For me, I find exactly what I want in the yorkie. Their size, stunning silky coat in that amazing Steele blue color with that sassy personality and regal golden head- I mean, it is amazing! I love it! I am so passionate about 'my breed' that I have calenders celebrating it, that I go to dog shows and call to find out the ring time for 'my breed'. For me personally, I could go tail long or tail docked ( and my guess would be the balance was the aesthetic balance the breeder was referring to) but I don't want to downplay the role of aesthetics in choosing a dog breed. Clearly, there are so many other reasons that a dog is your match or not – and I can go on and on about how Lilah fits my lifestyle with her personality etc. in so many ways that a different dog breed could not that have nothing to do with how she looks – well except for size I guess because that is a huge factor for me- but focusing solely on the aesthetic point, I just want to note that I think that it is important and should not be disregarded. Do we love our off standard Yorkie brothers and sisters? Absolutely! And again there is so much more to Yorkie love then just aesthetic… But I don't want to forget that aspect because I believe it is a valuable one and a defining role in what makes a breed.