But a technically very similar set of features results in a vastly different user experience. A driver with a Tesla autopilot has a way smaller margin of error and needs to react a lot quicker once the autopilot encounters a situation it can't handle. Flying planes generally have way larger error margins, and a lot of effort goes into making sure they are nicely separated from traffic and obstacles (and when they come close, it's known early and the pilots can get ready to take over). Until we have highways with similar traffic control cars can't match that without a lot more intelligence.