If the quality of doctors follows the same distribution as that one of SW engineers, taking advice of a stranger might have a similar use as looking for answers on stack overflow.
After all, they are all self-taught..
How could you possibly think that it does, considering the entire ocean of difference between their education and training???
Edit: Also in context of the conversation above, what I wanted to suggest is that that information can still be very valuable to whoever reads it. Even if it comes from someone who is not a doctor.