I intentionally opted out of these sort of driver assist features because I don't trust the firmware going into them. If a safety misfeature can be disabled manually you also run the risk of an insurer denying a claim if they find out it wasn't engaged. Better to not have it in the first place and use the mark I eyeball for safety.

Yeah, I'm not happy I have them, but I'm happy other drivers have them. I guess they help overall, since I need to be careful to keep a safe distance from the guy in front of me anyway.