Customers will buy your product (or service) if they think it will help.
If your product has many features, they will use those parts that help. And they will ignore those that don’t. They won’t tell you what is and isn’t helpful. They are, after all, focused on their problems, not yours.
When customers don’t complain, either your product is perfect, or it has been abandoned. Which is more likely?
When customers complain, it’s because they are blocked but think your product has the solution. Your product is in the right place. They think you are essential.