It's the difference between being a feature factory and having a real product strategy. If you actually have some kind of customer in mind, and you have ideas

It's the difference between being a feature factory and having a real product strategy. If you actually have some kind of customer in mind, and you have ideas of problems that you're solving for them, then this can be valuable feedback even if it's a lie. Digging into the feature might expose you to a new customer problem that weren't aware of. You can talk to other customers and prospects and understand if this is a problem they have as well. You can take that information and extrapolate it into a real set of use cases, think about the size of the market of "customers who have this problem," and decide if it's something that makes sense to tackle with your product. Then you can design features to solve the real problem. If you just have a feature factory then all you'll do is build the feature as the prospect specified. You'll go back, they'll still say no, and now you have no idea how to market this feature or if it would even be useful for anyone else or it's just built around the customer's internal process.