I think it’s not so much buying into it for most Drs, but they do it to avoid a lawsuit.
When doctors started practicing “defensive medicine” specifically cover their asses in the case of a lawsuit, just happens to be the same time I started challenging all recommendations that appeared to be overkill or simple pill pushing.
My last annual physical was a joke. Just asked questions, barely examined me and couldn’t get to next patient fast enough. Yep need a new doctor that actually cares about and know his/her patients.