That is the difference between a good and a great professional, in any profession.
Doctors have to do that as a routine. Because those are the only non biased sources of knowing about a new medicine, or a treatment procedure.
Not doing that may make them bad, but doing it will not necessarily make them good.
Yes. My dad is a critical care doctor. He regularly spends some of his free time reading medical journals, or studying for the re-certification exam.