I have had voluntary plastic surgery and was totally prepared for any pain, discomfort, swelling, etc. that would happen after the procedure. I also had pain medication, ice for the swelling, was totally cognizant of what and why this was going on and was willing to accept it for the results I wanted. (No, I didn't get boobs.)
Now, I also worked for 10 years in the veterinary business as a nurse. One of the most horrible surgeries I have ever assisted in was ear cropping. The dog's ear is very vascular and makes for extremely bloody surgery. Once you have seen and smelled all of that blood ------
The next worse part is when the poor puppy wakes up from anesthetic. He has no idea why his ears HURT, why they have something on them that he can't shake off and then when he shakes his head it hurts again. And with the shaking of his head there are spatters of blood all over the cage he is in. There is usually several weeks of aftercare involved and you are not guaranteed that the ears will stand after they have been cropped.
Tail docking, done at the proper time, does not seem to be as traumatic. On dogs which traditionally have their tails docked it is done when they are about 4 days old (along with dew claws), usually requires one suture which will disolve then they are back with Mom. Of course, you always run into someone who wants their dogs tail done when it is the same age as the ears are done and by then the bone has hardened and it is a much more involved surgery. Or the people who get tired or their dog's tail knocking things off the coffee table and just want it cut off and there are also situations that are just plain accidents or just plain stupidity ("I wrapped fishing line around its tail thinking it would just fall off.")
My opinions only, of course, and I know that we all have them. I won't lie and say that I haven't admired the look of a big beautiful Great Dane with his ears perfectly straight but personally speaking I couldn't put him through what it takes to get them that way.
Critter
One Vet I worked with got good results in getting the ears stand by putting tampons into the ears then wrapping them. Whatever it takes, huh?