Touch screens where tried and rejected by the military early on because people hands would get tired after a very short time interacting with a vertically mounted touch screen. Horizontal touch screens have other usability challenges.
Plus, they get dirty, and resolution is much worse - try to make pixel-resolution actions with touch, it's practically impossible. With the mouse, much easier. And, replacing a cheap mouse is much better than replacing an expensive high-resolution screen.
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Touch screens where tried and rejected by the military early on because people hands would get tired after a very short time interacting with a vertically mounted touch screen. Horizontal touch screens have other usability challenges.
Plus, they get dirty, and resolution is much worse - try to make pixel-resolution actions with touch, it's practically impossible. With the mouse, much easier. And, replacing a cheap mouse is much better than replacing an expensive high-resolution screen.