Not sure I follow. A person will not know the difference between before and after unless the circumcision happened as an adult. And if after is pleasurable, what is missing? Is anything missing? I can certainly take you at face value that your experience is more pleasurable than mine. I won't know otherwise. But I'm quite happy with my experience, so I don't really miss it. If anything, I might be trading off pleasure for endurance, which could be a net positive if that enhances the overall pleasure for both parties.
Reduced sensitivity is not necessarily bad is what I'm trying to get at. Complete lack of sensitivity is a real problem, a botched circumcision will do that. But a botched circumcision is just like any other botched surgery: a cock-up. Surgeons make mistakes and cut nerves they weren't supposed to in other kinds of surgeries too. To put more stringent labels on an accident, such as a crime on humanity, feels a little extreme.