The push for spaying and neutering comes form the humane societies perspective regarding reducing the number of unwanted preganacies and the resultant unwanted pups. I had my V neutered @6months as per the norm . But our last dog, a bearded collie, was not neutered until 6 years old. It was torture certain times of the year when neighbourhood bitches( speaking of distasteful terms!) were in heat. He was beside himself with desire, waking every am @ 5 or before, running off to a certain street to get his!!. I often wonder if we were responsible for some unwanted half beardies that he might have fathered. I understand your hesitation to some degree (I guess my husband felt sorry for our dog and that's why it took a while for me to convince him to allow the surgery.) In the case of breeders, if you are not showing or breeding you must sign a contract to neuter or spay. Vizsla breeders are very vigilant about keeping the high standard of the breed and don't want uncontrolled breeding going on - so from the breeders perspective it is for preservation of the breed.
So that's what the fuss is about. My dog is still all male. I hate that term "it" for neutered males! His personality did not change a bit. All that being said this is not a campain to convince you to follow suit. I believe it is a personal choice if you are not binded by contract. As long as the owner is responsible , keeps an eye at all times to make sure their dog(s) is not up to "mischief"!!
I have wondered, though if neutering might hinder the growth of the dog? Any opinions out there? Makes sense from a physiological standpoint to me: due to a resultant diminishment of growth hormones after neutering. And a friend of mine , who has a pure bred Golden retriever was advised by her breeder to wait til 18 months to neuter to ensure he reaches his full size potential. I'm curious if this has any merit.