Some of it is implicit, like 'is the person able to form cogent sentences', or 'does the patient seem to be struggling to stand'. Others are more explicit, like heart rate, BP, 'what medicines are you taking', etc.
Often the ones who need the most help are the worst at getting anything useful out.
I believe this can change if we change the amount of patients a physician must assess and treat in a given time period. Because that would be super costly (way more physicians required on staff) Nurse Practitioners and PAs would be a more cost effective way to delve into important and relevant information that takes time to uncover.
IIRC, as of several years ago, the supply of doctors is artificially constrained and hasn't really grown with the population.
That's very interesting, and explains many somewhat baffling experiences. So most of what I tell or give a doctor is effectively lost? That's the perspective from this patient, who finds it very frustrating to repeat myself, that the doctors are ill-informed and often perform that way.
But being open-minded: Is it that why I tell (or what most patients tell) the doctor isn't really useful to them? What is useful? Or is it just a consequence of time pressure?