Ok, there are certain questions which are foolish and others which might make a difference.
Some people do not like the weight question. If a person is not attracted to overweight people, not to say other people who do not care, why should they date? It might seem insensitive but it avoids embarrassing or terrible dates.
I heard girls ask if the guy is bald. I can understand why a girl would not want to go out with him. When you are 18-25, young etc, one wants someone good looking. Yes, after you are married and love each other, being bald is not a big deal.
Unfortunately, there has been cases where people take medications or are unstable and they end up getting divorced. Sometimes these weird questions is to uncover the truth from people who try to hide it.