Yes. You got my point. Asking questions and debating and watching other people ask and debate is a crucial part of learning. Have you ever learned a subject by just reading an article?
No, certainly not. Learning involves far more than just reading an encyclopaedia article, but Wikipedia's goal isn't to teach, it's to create a free encyclopaedia. An encyclopaedia is a very useful tool in learning, but it's not the end of the matter and never will be. If there are relevant encyclopaedic facts that are missing from the article, you can ask about them on the talk page or on the Reference Desks. If your questions are very specific or are more about a difficulty understanding the topic (and not just because the article is poorly written - that you can suggest we fix) then you need to consult an expert in whatever way is appropriate for the topic in question (a question about your wife's breast cancer would be directed at a doctor, a desire for a greater understanding of breast cancer would involve enrolling in medical school (you could try a textbook first, but they are often difficult to understand without the necessary prior knowledge) - Wikipedia will never be a replacement for those two options, even if we wanted it to be).