The Tesla owner is a fool, hope that isn't too harsh when applied to your friend / relative but it is a fact. The owners manual says "don't trust the technology, you are in control of the car" every driver assistance feature you turn on is listed as "BETA" on the controls screen. If you get in an accident Tesla (via their lawyers) says "you were in control of the car, the accident is your fault" Also, the instructions for Auto Pilot and TACC (Traffic Aware Cruise Control) say that they are only for use on freeways and highways, not for use on curvy roads or city streets.Coming down the mountain toward the park entrance, there are a series of 15 - 25 MPH 180-degree switchbacks. The autopilot had been slowing for most of these, but the last one it ran straight into it at 45 MPH, not noticeably slowing. The Tesla's owner says, "Trust the technology." but there was a vertical sandstone bluff staring us in the face; trust, but verify.
Bottom line, the Tesla autopilot is almost as smooth as a really good driver; but it's not yet anywhere near autonomous, but in the situations for which it is suited, it's magic.
Simply put, the owner of the Tesla risked your lives on BETA technology that is not meant for use on curvy roads while driving on roads with hairpin turns in the mountains.
The technology works pretty good on limited access highways, but the vision only Auto Pilot (they deleted the radar in newer Model 3 and Model Y) sucks on rural highways. In those situations it goes from a 15 year old with a learners permit with no instructions, to a nervous 15 year old with a learners permit and an angry father in the passenger seat that keeps yelling at him. At night on rural highways it acts like a terrified 8 year old behind the wheel with no adult supervision.
PS: Full Self Drive (Beta, Beta) when complete will be a "high functioning" level 2 autonomous system. No way in heII will they reach Level 4, let alone Level 5 with the current hardware.
PPS: I call FSD "Beta, Beta" because REGULAR FSD is a Beta system... what they are calling FSD Beta is actually an Alpha system that they are testing on public roads.