They are not MDA, they are physicians. Ask any anesthesiologist who is on his/her 50s on how the landscape was 20 years ago. They no longer put it into the ROAD specialties anymore because the average hours they work is no different than IM, and it's very close to some surgical specialties. These people were making banks working 40 hrs/yr and 14-16 wks vacation was the norm.
The mistake that doctors make is that we think some of the things we do are beneath us. The job of a physician is to practice medicine and if what you are doing is practicing medicine, it is not beneath you. It should not be beneath you to round and see your patients after they were operated on.