I think you hit the nail on the head there. The question as phrased is kind of nonsensical. From a bad foundation, it’s not possible to build a good UX. Correctly identifying the problem is a critical step in product development.

To take your transportation example, there is no good way to provide one product which scales from “shoes” to “airplanes” by user configuration. It makes no sense to ask if the shoe-plane is well implemented or not. It’s a terrible concept to begin with.