Well, they are getting paid to know something different than you already know, so expecting them to have some idea about what is going on does not seem excessively unrealistic.
On the other hand, for me, I don't expect a therapist to have answers about me. If she tries to give me answers about me, and usually such from her is unbidden by me, she is usually quite wrong. I expect her to have ideas about the sorts of things that I sought a therapist for and she can speak about them in general and I will go off and see, after pondering her information, if it was useful information or not.