Do you know the answer to this question?

There is no accounting for age-old customs and traditions, BBB.

So they can peep thru the keyhole.

Seriously?

Because I doubt they have the time to stand there and watch you get undressed.
Once I'm undressed it's a few minutes before the doctor comes back in the room. I'm pretty sure she's not standing outside the door twiddling her thumbs, but is busy with another patient, or charting.

If they stayed in the room and talked to you, asked questions, expected you to report why you're there, etc. I'm confident they wouldn't get as much useful information from the patient, as the patient would probably be preoccupied with what they are doing, perhaps shy or wishing the doctor wasn't there....The doctor doesn't have you standing there stark naked you know. You have the dignity of a sheet, robe, wrap etc.

I don't believe I've ever had a physician, nurse practitioner or nurse ever see me completely naked.

Because some patients would be disturbed if they or the nurses stayed.

They don't want to see your dirty underware. You know the ones your mother warned you never to wear but you do anyway.

Rap

I think Chai2 is right. Most doctors have little spare time to be with patients, dressed or undressed. The patients, I mean, not undressed doctors .

BBB

Yup, what Chai said.