If someone has 1+ interviews scheduled, they may not be prepared to give you an answer until they've explored their options. If you push the candidate to accept, they may just turn you down because they don't like being pressured.

Because the only acceptable answer is actually “it depends” and the point of the question is to find what it depends on.

It depends how you interpret the question. If I have objections that need to be overcome, it implies I don't like the offer. My natural answer to the question would be "sure", but that doesn't tell the interviewer anything about what I would "like".