[foerbert]

Not even Tesla is saying their system could or should be used that way. You're making quite a few assumptions about the capabilities of the system and going outside of the instructed and permitted use of the system if you are going to go read for 6 hours while the car drives itself.

Unexpected situations can and will happen. They are not at all as simple as "well the car will just detect it and break faster than me" by a long shot. What if there is debris on the road and the car misreads it? What if there are actually pedestrians because somebody got into an accident and decided it would be a bright idea to take a little walk?

I could go on, and I'm sure you or somebody else could answer every hypothetical I could come up with. That's not the point. The point is that even a "boring, predictable drive" is anything but. We put in a ton of processing power that makes that drive (usually) seem boring and predictable. A level 2 system is not designed to be let loose even in these circumstances.