Once I got my first real backup cam, I was instantly sold. I don't blame the regulators from requiring it, because it's such a huge, obvious win. Especially in parking lots, the camera has a vantage point at the back edge of the car that no mirror will give me, so I can see someone walking or driving down the aisle before I start to pull out.

The other thing I'd like to see more or less mandated is blind spot warning. I especially like the kind that is visible to other drivers. I don't even have it on any of my cars, LOL. I just like to see it on other cars that I'm passing.

Lane assist I am ambivalent about. I had AP, it was okay. It does not drive as defensively as I do, however, which meant that it increased my tension on long drives rather than reduce it. I do like good adaptive cruise however. That means no phantom braking :).