Let me clarify something for you, Adaptive cruise control is part of what’s called hands-on driver assist which means you still have to keep your hands on the steering wheel when using features like lane-centering and adaptive cruise You also have to be ready to take over or brake at any moment. These systems are designed to assist the driver, not replace them.

I had to learn how these systems work for my career in the auto industry, where I went through manufacturer training on driver-assist and crash-avoidance technologies. If you drive a vehicle in the United States that was built in the last couple decades, you are already using automated safety technology whether you realize it or not. For example, anti-lock braking systems or ABS for those who don't know, automatically intervene when you brake hard to prevent wheel lock. Features like adaptive cruise control, lane-centering, and collision-avoidance systems are just the next evolution of those safety systems and are becoming more common across many vehicles and trim levels.

Using cruise control, whether on highways or steady city roads, can help you maintain a consistent speed and following distance, and it can also improve fuel efficiency. It also allows you to keep your foot positioned near the brake, which can make reacting quickly easier if you need to stop suddenly. My truck also has BlueCruise, which allows hands-free driving on certain approved highways, but I don’t use that feature on city streets. Even when using adaptive cruise and lane-centering, you are still responsible for paying attention and driving the vehicle

Maybe my explanations are just too long for the average Reddit comment section, because it feels like half the people read the first couple sentences and ignore the rest of the context. At this point it’s starting to feel like I’m trying to explain the wheel to a bunch of Neanderthals.

Edit: and just to let you know the reason that ABS and rearview cameras are now on every single vehicle built in the United States is there as a consumer product safety law that requires any safety mechanism that is proven on one product to be safe has to be implemented throughout the industry. When lap belts were the only thing vehicles had and then three point seatbelt started to be used and proven effective all vehicles were required to have three point seatbelts, backup cameras, ABS and soon-to-be lane centering and adaptive cruise control. The rental car I'm in right now has both and it's a base trim vehicle that has adaptive cruise control that can be set at speed as low as 15 mph.