I think it's reasonable to ask a therapist to be informed on an issue a client is dealing with, or to want them to be better informed about it. I think it shows that a therapist wants to be helpful and isn't being arrogant, thinking they don't need to gain more information. My therapist has done this for clients early in her career and it's benefited me as a result. Even with things that aren't directly related to psychology, she brings herself up to speed if it's something I struggle with. Maybe she is extraordinary in this way, but I would hope it's not rare for a therapist to want to keep learning and understanding about issues that affect their clients' lives.