The vast majority of radical prostatectomies don’t have incontinence (like 95%), and impotence isn’t common either. Furthermore, they’re usually in older men who are already impotent.
Many years ago incontinence was a side effect but it isn’t common any longer as surgery has gotten better.
The story of how they discovered the nerves they were cutting that causes impotence is kind of crazy, because for years it is basically like nobody even looked into it. Then one day someone decided to and they figured it out pretty quickly. That was in 1982.