Customers are funny, though. People come to us all the time and say, "We love the simplicity of your software! It's just so easy to use! By the way, can you add (feature X) and (feature Y) and (feature Z)?" As a user, it's hard to recognize that the two ideas are actually at odds with each other. It's up to the product owner to keep the product well-maintained as it evolves.
Features that contribute to the core of the product, without interfering with the user experience, are the features you want to implement. In the water bottle example, the funnel and the paper towel interfere with the core offering (a convenient way to drink water), so they're rightly "unfeatures."
Features that contribute to the core of the product, without interfering with the user experience, are the features you want to implement. In the water bottle example, the funnel and the paper towel interfere with the core offering (a convenient way to drink water), so they're rightly "unfeatures."