The same is true for other breast cancer treatments such as a lymph node dissection or lumpectomy. Studies have shown that doctors who are more experienced with performing pap smears tend to end up with less false negative results and produce better quality pap samples. The situation is similar for birth control selection and implementation and diagnosis of gynecological diseases. Basically, practice makes perfect. Although family practitioners officially can cover routine gynecological care, they actually have limited specific training in gynecological matters and this makes up only a small part of their practices.
Obstetricians are practically the only doctors who ever deliver babies.
It is nearly impossible to find enough non-obstetricians to deliver babies, so the Republican legislation to allow pregnant women to visit an obstetrician is meaningless. Of course, this does not mean that another Patients Bill of Rights will be passed with the kind of protections for women that are truly necessary.