I greatly enjoy talking to people who ask good questions. The best way to learn something is to teach it, and largely this is due to the possibility of you teaching someone who doesn’t know what you do but is able to ask really good questions nonetheless.
The better a question is, the more it helps to organize the underlying corpus of data, and help to turn a body of facts into knowledge. The person who is in actual possession of the facts isn’t the best person to synthesize it, simply because there is too much hindsight bias – if you have known something for too long, you lose the ability to differentiate the simple from the complex, and when you are unable to shun complex analyses in favor of simple ones you lose your sense of direction when engaging in critical reductionist analysis.
On the other hand, if you are able to, through interacting with someone intelligent but ignorant about the specific topic, communicate the entirety of your knowledge in a pithy way, then you know that you really do get it.