I don't see what the big deal is; I lost mine when I was 8 years old and I haven't missed the darn things.
...Ha, just kidding.
Seriously though, IMHO half of the human species should be spayed & neutered, and that would put a quick end to starvation, most wars, climate change, the geopolitics of energy, and probably most of the violent crime as well.
When you see street thugs shooting each other, or the likes of Lay & Skilling (the Enron guys), think: ferals & strays. These can be prevented. All it takes is a little snip-snip.
BTW, I do hope your kitty was anaesthetised before Doc removed those pesky things.