10: CD Changers
Before we had music streaming services, there were CD changers, and for a long period, this was the accessory of the elite. So aftermarket CD changers took the place of factory options and these became quite the fad. Disc changers were frequently stolen and it would cost the driver hundreds of dollars to try and get one replaced.

With the rise of built-in USB functionality and music streaming the need for a CD changer went away. Thus, adding a CD changer is a fad that we rarely if ever see anymore. Most drivers are at least somewhat satisfied with the factory audio options that come with their vehicle.