I really don't see the need for a temperature setting readout. The advantage of a physical dial is I can set a temperature based on muscle memory; I know if I turn the dial all the way right or left and the a set distance about what temp I have set without looking at the dial. Minor tweeks based on too hot or cold can be similarly made. A far more functional UI than having to look at a touch screen and drag or tap to change the temperature.
If you have a physical knob, are you suggesting it doesn’t read out the temperature ANYWHERE in your vehicle? Highly doubtful. Ignore it if you want to, but more than likely there still some digital display with a temperature read out. At least anything made in the last, like, 20 years.
If your vehicle has physical buttons and dials for climate, then your muscle memory still works with CarPlay. I still know how to adjust mine despite having a large touchscreen in the center. I don’t have to look at the screen, but it’s there.
I feel like you’re arguing in bad faith or are being obtuse to try to gain some kind of validation. Especially in response to the fact that there are already CarPlay-compatible vehicles with physical controls for climate that would simply read out to a built-in display because the computer in your car has that information and the new CarPlay will simply have access to that data. Yes, some vehicles will not have physical controls, and many people will likely reject those because they also prefer the tactile feedback of a knob. That’s why so many manufacturers have brought those controls back to work in conjunction with touchscreens. It doesn’t have to be one or the other, no need to create a false dichotomy.