Exactly; and the mechanical case is often "field fixable" by a person with a modicum of experience learned while tinkering with cars (a mate of mine in a few minutes in my case), whereas now a tech needs to connect a laptop somewhere on the car to even begin a diagnosis.
Marginally relevant sidepoint: I remember reading that the one of the advantages enjoyed by the Americans over the Japanese in WWII was the formers' significantly greater expertise in mechanical maintenance of front-line equipment gleaned from their culture of fixing up and maintaining automobiles at home.