You can type blind on a center console touchscreen, but you can't memorize the location of 6 buttons that don't move? I'm not buying it, doc. Besides, the buttons should at least have a ridge where the edges of them are, even if the buttons are smooth. If they're those shitty, completely smooth capacitive "buttons" that some electronics have anymore, I get not being able to discern them, but that's still the same problem as the touchscreen - no tactile feedback.
I also wasn't exactly trying to say exactly how your radio is laid out, I have no idea on your specific model. My point was that the buttons don't move, they're always in the same spot, so you just learn where they are.