Quite simply it is that Doctors believe they are the most intelligent people in the room whenever they walk in. They will accept no management advice, no time allocation advice, no parking advice, no dietary advice . . . no advice.
They believe that they are already operating in the most efficient manner and that any change will put patient lives at risk. Well . . . actually they don't believe this, but this excuse is used every time they don't like something. A quick "OOooooo - patient lives at risk" and any progressive idea is already on the back foot.
This ideology permeates through the health care system with consultants at the top right down through the chain to the nurses.
Getting these people to agree on ANYTHING is a Herculean task.
A friend of mine (a Doctor) was on a committee trying to bring more IT into the healthcare system in Scotland. He is very IT minded (read geek) and was keen as mustard to help push things along. Within a handful of months, he was at the end of his tether due to the sheer deluge of nonsensical crap that was being floated purely to waste the committee's time and ensure that nothing got done.