The usability of a product is supported by its user interface. But there is more to a good product.
It requires to think about service.
My GPS navigation system is designed for someone else. Most probably for drivers who do long-distance drives, prefer main roads, need traffic information and don’t use the map to determine a different route. It’s for people who don’t want to think about their route and prefer to leave all the decisions and responsibility to the navigation system.
The assisted drive system, on the other hand, followed a different choice. It’s designed for people who want to continuously think and interact with the car. Those seeking the comfort of having the car handle speed adaptation need to imagine that the car can do so and need to search for the option allowing that switch.
Usability means to provide the user with the means to find what he may be looking for, make those options accessible he didn’t know to exist and help him find what’s not possible.
It does require giving up the idea of being right. That is the idea of having made the right choices.