I mean, it’s news to me. I‘m not subscribed to Michael MJD, but I’ve definitely watched videos of his when they pop up in my recommended videos on YouTube and typically enjoy them, and this one hasn’t been recommended to me yet.
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Video Shows Off Prototype Touchscreen iMac... From 1999
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The idea of a touchscreen is a lot older than that, I’ve seen and used it in an HP office in Geneva in the early 80s, before people knew what an UI and Mouse is 
The HP-150 from 1983:
en.wikipedia.org
The HP-150 from 1983:
HP-150 - Wikipedia
The Plato IV https://en.wikipedia.org/wiki/PLATO_(computer_system) used a monochrome capacitive touchscreen plasma display back in the early 70s. The PLATO system is far less well known than the early timesharing scenes out west and at MIT (or UNIX, for that matter), but it was a massively historically significant computer environment.The idea of a touchscreen is a lot older than that, I’ve seen and used it in an HP office in Geneva in the early 80s, before people knew what an UI and Mouse is
The HP-150 from 1983:
HP-150 - Wikipedia
Yes, I was using a Sirius Systems Victor 9000 in the early 80’s with AutoCAD. It had a touch screen and a corded pen. The screen had a fine mesh of black conductive wires that transmitted the coordinates to the pen. It was faster that the IBM PCs of the day and that touch screen was a big boom for CAD work.The idea of a touchscreen is a lot older than that, I’ve seen and used it in an HP office in Geneva in the early 80s, before people knew what an UI and Mouse is
The HP-150 from 1983:
HP-150 - Wikipedia
Yes, your arm did get tired after a while from holding the pen up to the screen. That is a problem with any single input mode. Repetitive movement or positioning can be tiring or irritate tissues. When I have used laptops with touch it I also used the trackpad or a mouse or keyboard some some interactions and regularly switched modes.