There are plenty of stories/opinions one way or the other. What occasionally comes up are situations where doctors unexpectedly arrive at accident scenes, take over, and apply procedures that the ambulance crews are totally untrained for.

"Dr. Mark Forrest knew he had to act fast to save the life of a man he watched go into cardiac arrest after a motorcycle accident — so he opened up the man's chest right there on the road and brought him back from the dead."

https://www.cbc.ca/news/canada/british-columbia/doctor-who-s...