Going back to Devarshi’s original point, I think it is actually good that sometimes a user’s needs are a bit vague. This allows the engineer to be a bit more creative catering to the needs of the user.
For example, if a user is especially specific “I need a blank stent of blank length made of blank material coated in blank” then that narrows down what the engineer can create.
However, some of the best devices are those that can cater to a variety of people, such as the smart phone. A large population majority of the world uses them because they are applicable to multiple needs. I understand that this is not always the case for medical devices but I believe that this might be more lucrative for companies in the long run.