Firstly, you might consider that close to all basic ideas behind objectively successful products (eg the telephone, Facebook, photo copiers, Twitter, rabbit vibrators) were NOT arrived at by asking the target audience what they wanted. Most were intuition born of observing that audience.
When you ask people direct questions about what they want, it takes a great deal skill and judgement to actually get a successful product idea from that. In fact it's almost not worth the bother, and few professional designers really do it very often by choice. Far better to try to observe what people do (often by giving them tasks to complete in some sphere of activity) and see what comes out of that. You might see your target audience performing needless operations, misunderstanding things, or doing things that appear irrational to you but rational to them. Once you see that sort of thing happening, it's far easier then to see what they might need or really want.
I wouldn't go so far to say that asking people what they want is a bad idea, but it's getting close. Perhaps it's a mildly toxic idea best avoided in preference to observation.