I agree with your co-worker, but for multiple reasons aside from not being able to imagine not being able to feel again. Not being able to feel can be incredibly dangerous. When I was 15 I accidentally shut my hand in a sliding glass door and cut through my pinky finger, through the muscle and the nerve. They did a nerve graft from my wrist and moved it to my finger so I wouldn’t lose feeling in it. They explained to me the risks of not being able to feel in just that little finger and it was scary. A couple of the examples they mentioned that I most remember is are if you’re cooking and put your hand down but your pinky happens to hit a hot burner on the oven, you could end up with severe burns. Or if you’re working with tools, something could easily happen so that you’d lose your finger. I can’t imagine the risks of not being able to feel anything in your entire body.