What ones? I don't like cars with too much tech, I wish the little Chinese electric cars that are basically built on golf cart chassis were street legal in more of the US
Discussion
The projector joke (?) got me thinking of this
Projector would actually be a really cool feature for a car but I believe more phones should be like this 
I'd also carry a folding keyboard/trackpad thing separate from the phone so it can be turned into a computer. Those already exist
Sorry I missed your call, left my projector at home.
Reminds me of this usb second monitor thing I had a while back. Was decent to add to a laptop, but a bit dim and ultimately I stopped using it.