@quentinsf Indeed! I would hate to see someone try this in Cambridge!
You are right, of course: it's really just a fancier cruise control. My issue is that it's marketed very differently.
It's not called "advanced cruise control" or anything like that, it's called "Full Self-Drive (Beta)". From the marketing, it would be very easy to believe that it can be used on all types of streets and roads, when that is clearly not the case. It is not even close to being ready for driving on city streets.