I’m a decent driver, I never use my phone while driving and actively avoid distractions (sometimes I have to tell everyone in the car to stop talking), and yet features like lane assist and automatic braking have helped me avoid possible collisions simply because I’m human and I’m not perfect. Sometimes a random thought takes my attention away for a moment, or I’m distracted by sudden movement in my peripheral vision, or any number of things. I can drive very safely, but I can not drive perfectly all the time. No one can.
These features make safe drivers even safer. They even make the dangerous drivers (relatively) safer.
Driving a car takes effort. ADAS features (or even just plain regular "driving systems") can reduce the cognitive load, which makes for safer driving. As much as I enjoy driving with a manual transmission, an automatic is less tiring for long journeys. Not having to occupy my mind with gear changes frees me up to pay more attention to my surroundings. Adaptive cruise control further reduces cognitive load.
The danger comes when assistance starts to replace attention. Tesla's "full self-driving" falls into this category, where the car doesn't need continuous inputs but the driver is still de jure in charge of the vehicle. Humans just aren't capable of concentrating on monitoring for an extended period.
Driver fatigue is real, no matter how much coffee you take.
Lane-keep is a game changer if the UX is well done. I'm way more rested when I arrive at destination with my Model 3 compared to when I use the regular ICE with bad lane-assist UX.
EDIT: the fact that people that look at their phones will still look at their phones with lane-keep active, only makes it a little safer for them and everyone else, really.
As an example, after a refreshing 8h night's sleep, you put yourself at the wheel and you know you need to drive for 8h. After 2h, you'll feel the need to stretch your legs, have a bite, go to the toilet.
But if you have something like Tesla's AP, you'll still be alert and awake. Otherwise - at least for me, but I bet for many people - the constant nagging of micro-correcting the wheel, keeping the distance to the car in front, keeping the right speed, takes a huge toll on your mental resources, so much that it puts you to sleep whether you want it or not, and many people will try and push through that regardless.
You're saying that cruise and lane assist are dangerous because they're used to do bad things.
I'm saying they're very liberating from the busywork that is driving, and even people that use them as an excuse to stay on their phones are better off for it, because something more alert and precise is driving for them and as a consequence, less harm can derive from their stupidity.
I'm not saying that people that do stupid things should not be punished, and I'm quite happy that Tesla had to implement better driver monitoring. I know how things work and that I always need to monitor the system, but many people assume it's a magic button and disconnect their brain.
If someone is driving dangerously despite these safety features, they should not have a license to operate a motor vehicle on public roads.
These features are still valuable even to safe drivers simply because safe drivers are human and will still make mistakes.
FSD is not perfect, but it is everyday amazing and useful.
(They also say there's still the handoff issue if a human needs to take control but it's still a big net win.)
1. https://www.reuters.com/business/autos-transportation/tesla-...