That is exactly my point. It's not worth asking because it doesn't tell anyone anything they don't already know. The ones employers ask are the same, though they want you to blow smoke up their ass about how it's been your dream to write backend code for an insurance company since you were a kid.

I don't like wasting time in interviews on questions or exercises that don't help at least one party decide if the other will be a good fit. Unless you a hiring for a position where someone regularly needs to lie about why they're engaging another party, these questions are rarely if ever valuable.