I have similar reservations. The customer doesn't always know what they want. However, would you agree people often can predict how they will behave if accurate

I have similar reservations. The customer doesn't always know what they want. However, would you agree people often can predict how they will behave if accurately presented with a product? To spend 15 minutes to put an idea and a question out there, it could yield quality results for accessing a direction. Especially if A/B testing a screenshot or elevator pitch.