Re: They kinda do and kinda don't
Level 4 self driving cars do exist, just not as sold products. Several of the car manufacturers have working prototypes. They are still not roaming free due to all kinds of things, but they do exist. And they are currently driving in real traffic in a couple of european countries, for testing.
The stuff available on the consumer market currently, such as the Tesla, is a level 2 "autonomous" car. Level 2 being "Need user to be an active watcher and decision maker".
Level 4 means the car does all the driving, takes all the decisions and you can doze off, surf pornhub, or whatever you like. They are expected to hit the market in 4 years. The level 4 autonomous cars, that is.