I remember having this argument with a friend.

My argument was that the idea that the name Autopilot is misleading comes not from Tesla naming it wrong, it comes from what most people think "Autopilots" on an aircraft do. (And that is probably good enough to argue in court, that it doesn't matter what's factually correct, it matters what people understand based on their knowledge)

Autopilot on a Tesla historically did two things - traffic aware cruise control (keeps a gap from the car in front of you) and stays in its lane. If you tell it to, it can suggest and change lanes. In some cases, it'll also take an exit ramp. (which was called Navigate on Autopilot)

Autopilots on planes roughly also do the same. They keep speed and heading, and will also change heading to follow a GPS flight plan. Pilots still take off and land the plane. (Like Tesla drivers still get you on the highway and off).

Full Self Driving (to which they've now added the word "Supervised" probably from court cases but it always was quite obvious that it was supervised, you had to keep shaking the steering wheel to prove you were alert, same as with Autopilot btw), is a different AI model that even stops at traffic lights, navigates parking lots, everything. That's the true "summon my car from LA to NY" dream at least.

So to answer your question, "What's the difference" – it's huge. And I think they've covered that in earlier court cases.

But one could argue that maybe they should've restricted it to only highways maybe? (fewer traffic lights, no intersections), but I don't know the details of each recent crash.