Erm, i would wager a question like that is intentionally transparent. and it is not as if these questions have to be said without elaboration. in my opinion it can be helpful to start conversations on subjective topics with an example, to suggest what one is looking for (or looking to avoid), or otherwise provide context on what may violate the work life balance for the particular individual.
For less experienced interviewees it may be vital to provide an example or boundary. Maybe the interviewee doesn't know how to respond to a reply of, "Yes, we have good work life balance." Even if the interviewee asked for elaboration on why it's good, that can give a perfect stage for the interviewer to say what wants to be heard instead of providing specific examples (i don't mean to say this is always malicious behavior, though sadly I'm sure that happens too).
For less experienced interviewees it may be vital to provide an example or boundary. Maybe the interviewee doesn't know how to respond to a reply of, "Yes, we have good work life balance." Even if the interviewee asked for elaboration on why it's good, that can give a perfect stage for the interviewer to say what wants to be heard instead of providing specific examples (i don't mean to say this is always malicious behavior, though sadly I'm sure that happens too).