When you send your cat in to have its uterus, does it help this particular cat? No, it doesn't.
Umm you might need to do some more research on this. I know that you think you are so "educated" on all these procedures, but spaying does in fact help the cat. It greatly reduces the chances of serveral types of cancer. So hmm, a few days of pain or years of pain and dealing with medicines, chemo, a shortenend lifespan... yeah you need to read up more because spaying does help the cat!