I think there may be a fundamental flaw with lane keeping. It removes the driver from doing anything but still requires constant vigilance. That might be asking too much. My ADD is too strong to wach the road without having to do any part of the driving. I suspect a lot of people are the same way.
If most drivers are just keeping their hand on the wheel while day dreaming, Telsa should be forced to just disable the feature until the tech is ready for Level 3. Or use the Level 2 tech as a backup only.