Car makers have been trying to make auto high beams since the 50's. They all gave up. There are even more variables now - can't see it working well. If you can't control your own high beams - as well as other basic auto functions - you shouldn't be driving.
They didn't all give up. My new SUV has them. My girlfriend's Model 3 has them. They're amazing on poorly lit, windy roads (e.g. heading to the mountains) where you want to focus on driving and not on flicking your high beams on and off constantly.
Ok, I stand corrected maybe! Even if all these systems work flawlessly - are they really necessary? Also, what happens when one of these systems malfunctions? In the case of auto-dim headlights - probably not a big deal. But, what about adaptive cruise control or lane assist? Suppose a sensor or computer fails - do you get a warning of some kind, or does the system disable its self and inform you? How about when the car ages - will these systems function as expected after years of use and an accident or two. Once the used car market is flooded - good luck.
I'm sure there is a market for these type of things - but if I'm going to be responsible - then I want to be in control.
These systems are designed to fail gracefully. If a sensor stops working, the system stops working as though it's not there. It doesn't go crazy and accelerate you to 150 or slam you into a wall. This isn't the 80's. Electronics have come a long way. They are more robust. They are capable of monitoring themselves. The programming behind them is far more intelligent than before.
Would you have maintained your same sentiment when power steering was invented? When anti-lock brakes were invented? When we moved from simple leaf spring suspension to more complicated suspensions? Drive/brake-by-wire? Airbags? The list of innovations that you could have said "but what if it fails? then what? how do you fix it? how does it behave?" about stretches back to the first car. And yet we have all of those things now and, while they occasionally fail from time to time and require service, they are beneficial and work most of the time.
I don't care to have:
- blind spot monitors, but if it keeps someone from changing lanes into me, great!
- auto emergency braking systems, but if it keeps someone from rear-ending me, great!
- radar cruise control, but if it keeps someone a safe distance from me, great!
- lane keep assist, but if it keeps someone from accidentally drifting out of their lane, great!
Despite the added complication and risk of things not working automakers have continued to innovate and add features to vehicles. We're all better off as a result.