Forget the dash controversy, ignore the HUD/no HUD questions, who cares what size, shape, orientation, or angle the display is ... none of it matters if all the features are completely, and reliably, controlled by voice!!
Ok, the HUD would still be nice but a lot of the screen stuff becomes irrelevant if you can say things like
Roger, turn the wipers on low (assuming you've named you car Roger, if not it would be silly to call your car Roger if, for example, you've named it Sally)
Roger, set the temperature in here to 71 degrees.
Roger, turn on the high beams.
Roger, please eject the passenger if he continues to try to change the radio station. (My name is Dave, so Roger could then respond with "I'm sorry Dave, I'm afraid I can't do that.")