Dude, what common sense approaches about pregnancy do you think go against the scientific recommendations?
Please take a look at the CDC data over the last century. In 1915 infant mortality was _10_ percent. Maternal mortality was around 0.8% in 1900.
https://www.cdc.gov/mmwr/preview/mmwrhtml/mm4838a2.htm
Are you seriously claiming that these things dropping an order of magnitude has anything to do with common sense, or not listening to doctors?