I agree. If I am asked a question outside of my domain of expertise, I'm not going to BS around it. I will say that I don't know and start asking questions so that I can learn the topic.
If you want someone to BS answers all day long, then you're hiring for a CEO.
Each one of your employees should fit the bill for future CEO. I see that as the point for hiring smart employees. It's someone who will pick up your stuff and run with it in directions you might not have thought about.
If you want someone to BS answers all day long, then you're hiring for a CEO.