I believe the answer is to get a complete impression of the person.
It’s not to force the interviewee to give straight answers because they might be more stressed. It’s not to give the interviewee time to think over questions because that would make more sense to give them a paper to fill out as an interview.
Answer: Sorry, I can only answer part of question 5. But I prefer sonnet one because I feel like there's a lot more emotion and the emotion helps me understand it more.