'Full self driving capability' is a hardware capability, not a feature that you can turn on - it is there so you don't need to replace the hardware when the autopilot software can be replaced with fully autonomous driving software.
Edit: Downvoters, please explain. It is not okay to redefine words for your purposes.
In your opinion, in front of the court of law, would you consider that John Smith has purchased a car that has something called "Full Self-Driving Capability", or not? In front of the same court of law - would you consider that Tesla advertises such a thing when presenting their cars?
>>Autonomous features are not called autopilot anywhere, ever.
You are absolutely correct, other car companies call this what it is - (adaptive) cruise control. Not autopilot.
>>'Full self driving capability' is a capability, not a feature that you can turn on
Well, but the website itself says that at the moment, as-is(not in the future!) the car will be able to autonomously drive from on-ramp to an off-ramp on the motorway - so.....that sounds like a feature to me? It even has a button for it! What is it about turning it on or off?
That it does so as safely and legally as a human driver is implied by the word "full"
Besides, how would you even establish that the hardware is self driving capable if the software isn't? You might need to change the hardware once you realise the software needs changes too?
There is no "full self driving" button in a Tesla, and the Autopilot button will first produce a notice about the capabilities and it says you absolutely can not stop driving, you have to confirm it before it engages.
You can argue wikipedia isn't a valid source, but IMO that's not in good faith. So, 'autopilot' has a shifting meaning depending on aircraft capability.
ADAS are designed as an additional safety level for ACTIVE driving, when the driver is 100% driving the car, and not for a potentially much more dangerous situation, when the driver (as encouraged by the manufacturer) is completely disconnected but supposedly "alert" at all times.