Re: Because most Tesla drivers are not pilots.
Go to a car show. Here in the US, vehicles over a certain age seem to be called automobiles, not cars or autos. There is no exact cut-off date, it seems to be attached more to the "classicness" of the vehicle in question. The term "auto" is mostly used by old-timers talking about V8(ish) powered luxury cars from inception through the late 1960s/very early 1970s ... There are exceptions to the above, do not take them as hard and fast rules.