Open ended questions enhance participation imo. Precise questions tend to be manipulative or become a disguised strident statement such as 'Why is Scientology a religion and not a cult?'

Hypnotic states of mind and how they are achieved is not the main issue. The message, post hypnotic suggestion or mind set shift is the most critical factor in shaping thought patterns and behavior.
Its like where you are going is more important than the vehicle that you take. Of course there is an old saying that 'it is the journey and not the destination' which is a language pet peeve to me. :^/