You're making a lot of assumptions that aren't true. I regularly instruct doctors on my condition in detail, they do usually listen and are reasonable. However, I am often disappointed by the lack of depth of the research they do in advance of meeting (and billing me exorbitantly).

Recently, my sister (same condition) drove a couple hours to see a specialist who had obviously not read her file or done any research and made some truly awful suggestions (one that could certainly have lead to her death if she had followed it). He billed her for the time.

Doctors are like coders, some are orders of magnitude better than others. Some are so bad, they have a net negative impact on your health.