[e28eta]

I remember listening to this Freakonomics episode [1] on the phrase.

It covers a variety of times people might use it. Sometimes it's genuine, other times it's flattery. Some people use it all the time (and in the episode they talk about calling someone on it). One guest says it's a bridge, to go from the question asked to the question you want to answer instead.

I don't see it in this transcript, but I also thought I remembered hearing/reading that it can be a sign the speaker doesn't know the answer offhand, and needs to consider the question to formulate their answer. I think I'd classify that as a genuine usage: the question is something the speaker hasn't considered before, and thinks is worthy of consideration.

[1] https://freakonomics.com/podcast/thats-a-great-question-rebr...