The argument for adaptation is a red herring. Our brain uses neuron networks and they are highly adaptable. The fact that we adapt to change does not make the change positive.
Some things are very objective and easy to assess without long usability tests. For example, if we assume that safety is more important than aesthetics then the shorter the distraction the better the UI is. Hence, fewer clicks to operate a function (especially a safety related one), the better. The new interface increases the number of clicks to operate the defogger. Hence, it is a degradation in functionality.