NOTHING that is health-inconsequential should be REQUIRED. Sounds like those rules need changing as well.
The weird thing is, if someone over here (it's banned in Europe and other countries) has a docked/cropped dog, they're not eligible to be shown in places like Cruft's Dog Show. If someone imports a dog from over there, it's going to arrive with natural ears and a full tail. I object to anyone cropping and docking after they get here. Their tails have started to get hard, and their ear leathers have more blood flowing through and have also had some cartilage hardening.
The only thing those countries allow for ears is in some breeds where you tape up a dog's ears to make them stand up like a German Shepherd, or a Corgi like Barkly. Not all dogs will bring their ears up on their own. It's healthier for them to have their ears up because air being allowed to flow helps prevent ear infections. People that have cropped breeds do it because of the same reason. It's not all about looks like some will contend. Having ears up also aids in hearing. I'm honestly not sure why all dogs with suitable ears aren't just taped up instead of cropped. But I guess they didn't have tape way back when the practices were first begun.
I've had several dogs that had either been cropped or docked when I got them:
Fritz--Minature Schnauzer, cropped and docked
Three Airedales--docked, ears taped to fold properly
Sharkly and Barkly--ears taped to stand
Vlad--docked
I honestly don't know of any breeds that MUST be cropped and/or docked due to standards set forth as contended by some people, but I know a lot of people with dogs that have been.