Earlier quoted context omitted.
It's because it's way, way cheaper and more flexible to use a touchscreen PLC, like one of these: https://www.automationdirect.com/adc/Shopping/Catalog/HMI_(H... than a huge mess of buttons and wires. Just look at that linked product! Less than $500 and you have as many buttons and labels as you can shake a stick at, and it's all behind a pretty color display. I can hardly buy 3 buttons, a vinyl overlay, and pay for…
>Less than $500 and you have as many buttons and labels as you can shake a stick at, and it's all behind a pretty color display. A raspberry pi + touchscreen is 1/5th of that. RPi is capable of running Qt5 which would be a solid UI choice. How the heck have they survived?
Value was added. Sometimes, simply knowing what product to purchase is worth hundreds of dollars.