How is it less of an ordeal?
For starters, male castration is over and done with in a few minutes, and is non invasive and heals quickly.
Female spaying - yes, more invasive, but once it's done, it's done. Healing for a week or so and then back to normal.
Cropping - general anesthetic, in terms of how far the scalpel has to travel - a huge area of cut, a huge area to scar.
Then WEEKS of aftercare, it is a part of the body that will be knocked often. Taped up - risk of infections..
It just isn't even comparable.. Like going in for gall stones, or breast implants.