If you are going to say 'standard of care' you need to share where that standard of care originated from. Different standards are set by different organizations; which one(s) are you referring to? I did a quick search and can't find a 'standard of care' that directs us to neuter, only ones that detail the methods and care provided regarding procedures. Also, why do you think that studies on S/N are only conducted at vet schools? Our behaviorists conduct a decent amount of studies among shelter populations, many of which are not altered prior to adulthood. I would actually argue that quality breeders (with intact animals) are as likely to use veterinary services at a teaching hospital, thus a teaching hospital will still see well-cared-for intact animals, as well as animals that were neutered as adults (shelter rescues with devoted owners.)