Isn't this just an illustration of the potential pitfall of the tendency to simplify UX to cover just the 80%? Here, the design seems to be following the idea

Isn't this just an illustration of the potential pitfall of the tendency to simplify UX to cover just the 80%? Here, the design seems to be following the idea that an owner of the standard edition of the car doesn't need to be made aware of the existence of a heavy duty version of the car. But a person who owns the heavy duty version and is not aware of it is not guided to this knowledge because the UX hides it from them. It is difficult to say that this is what happened, maybe the author was presented with the choice of standard edition or heavy duty edition and genuinely selected the wrong one. Unclear from the description, but yeah, if I have to type in the car model and there is some sub-type, that sub-type should probably be required. It sounds (to me) like this is a case where someone decided to hide the essential complexity of the choice and made the choice accidentally simpler than it actually is.