Why does the car allow self-driving in "conditions it's not intended"? It's not like the car doesn't have the sensors to know! Just disable it.
Why does the car allow overspeeding? Why does the car allow the driver to use a phone while driving?
In the end it’s the responsibility of the driver.
(I’m not saying I agree with this view, but this most probably the one behind Testla choice, as well as… cost, obviously).