You should be more concerned with what I'm doing bluetooth than whether or not I let the car keep a safe following distance from the car in front of me since if I'm in a heated discussion with my ex on the phone, I'm paying a lot less attention to the road than I should be, and I'd be better off letting the car do most of the driving.

None of the driver assistance features I listed above allow hands-off driving, if ACC fails, my car will slow down, or maybe get too close to the car in front of me, but since I've already got my hands on the wheel and looking ahead, it's not a big deal.

The poor state of automation for most cars actually ensures better driver attention -- LKAS works around 80% of the time on the freeways. If it worked 99% of the time, I'd be less focused on driving.