Without claiming that it is directly relevant to the question, let me quote Atul Gawande, from “The Score: How childbirth went industrial”
Yes, he said, many studies did show fabulous results for forceps. But they only showed how well forceps deliveries could go in the hands of highly experienced obstetricians at large hospitals....Forceps deliveries are very difficult to teach—much more difficult than a C-section
Without claiming that it is directly relevant to the question, let me quote Atul Gawande, from “The Score: How childbirth went industrial”
Gawande is great. Collect them all. Also, Lewis Thomas.