This does not mean insincerity, it means recognizing the fundamentals of our social lives. It turns insincere when we play inappropriate games. Do not be afraid of asking questions that cannot be answered. Finding the mystery in your character will help you recognize the secrets that others carry. Secrets give choices a special flavor.
Mystery lifts the stakes.
The big questions are the most interesting and prompt dialogue. Little questions find their answers quickly. They must be answered, but will not serve as the soul of a character.