This statement seems a bit contrary to what PSYDR said. If you specialize in a specific area, and you've been at it awhile, what stuff is there to always know?
Not necessarily, if the statement by PSYDR you're referring to is this one: " If you are competent, you learn everything you can about those diagnoses, treatments, legal ramifications (even if you are not forensic), prognosis, etc."
If you are a competent practitioner, then yes, you certainly do learn everything you
can about the diagnoses you typically see. This makes good sense and is an ethical obligation. However, even "just" in something like dementia or TBI, there can be a lot to learn and stay up with. And when, like me, you work in more of a generalist role, it can spread you a bit thin at times (e.g., jack of all trades but master of none).
Even with all that, as PSYDR mentioned, you'll generally get a feel for a variety of conditions based on qualitative observation and information gathered via interview. Still, no two people are alike, so even the "cookie cutter" cases can be interesting as you come up with tailored recommendations and the like. Plus, to be honest, it's nice to have some fairly straightforward and less-complex cases now and again.
There's
always something more to know. Maybe not always earth-shattering, but research is continually coming out. And when you see a case that involves things you don't often see, it can lead you in all sorts of new directions RE: intellectual curiosity.