Unless the person you're asking has specifically asked you for questions you shouldn't approach every situation as an opportunity for you to learn. Sometimes the situation is about other people, their work, and accepting what they've done as a valid use of their time. Asking a question that could potentially invalidate the effort they've put in, even if you think it's a reasonable point to raise and you think you could learn from it, is just incredibly selfish.
A key skill in communication is anticipating what the potential outcomes of what you say might be in a particular situation. In this case, the question can be valid, but it can also be completely the wrong thing to ask.
A key skill in communication is anticipating what the potential outcomes of what you say might be in a particular situation. In this case, the question can be valid, but it can also be completely the wrong thing to ask.