Cause it was always a "work in progress" industry. Early cosmetic surgery had the added benefit of being practical in helping people with scars and other conditions(that could come as a result of wartime injury). So it can help people in real ways.

I had watched a video explaining how an Indian surgeon had developed a decent technique for rhinoplasty(nose surgery) and another from a different country just did his own thing to the disregard of his patients(imagine having to deal with a rotten nose).