When it was simply cheaper to use a screen - period.
I have never heard anyone say "please replace my volume knob with a ridiculous screen slider bar", or "please replace my very easy to use climate controls to a screen where I have to take my eyes off the road to use them", or "please bury my seat heating controls in a screen menu so I can't find them easy"
But I have heard many, many people request to bring back the buttons.
Just like it was cheaper to not have a physical touch keyboard on a smart phone. Has nothing to do with technology, it's just all about the $$$ savings.
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