Big difference between needing to keep attention on the road because the car is liable to hit parked cars obstructing the travel lane, and merely having to be ready to start paying attention when the operational design domain of a L3 system is no longer met. Like for this Drive Pilot, when traffic speeds up to 40 MPH.
The only thing is whether or not Mercedes will take liability for their system if it causes an incident while operating within their defined driving limitation (eg. 35mph). If they still say "it's up to you", it's tough to trust it enough to read a book or watch a movie.
