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I don't want a touch screen OR voice controls. I want knobs and buttons.

I can use a physical control without looking. It isn't confused by wind noise if my window is down. It doesn't bother a sleeping passenger.

The only disadvantage to physical controls is mapping them to an ever-larger number of functions. The early iPods did that well with their scroll wheels and single button, but there are limits.

Then again, maybe the large number of functions is the problem, not the controls.

I'd really hate to have to have to say "increase driver side temperature by 2 degrees" when I could much more easily just turn a knob without looking, thanks to muscle memory & tactile feedback.

Me too, but I change temperature so rarely that it being on a touch screen would not be an issue either.

But, your car can take so many commands that one cannot make a physical knob for everything.

When driving, tactile response is a key safety feature, so you're eyes don't have to leave the road to make sure your button was pushed. However, I totally agree that the voice command is the next step, it is the only time I use Siri!