"We've done tons of user testing on this, and it turns out it doesn't work," Jobs said at the company's "Back to the Mac" event in 2010. "Touch surfaces don't want to be vertical. It gives great demo but after a short period of time, you start to fatigue and after an extended period of time, your arm wants to fall off," Jobs continued. "It doesn't work, it's ergonomically terrible."
https://tech.yahoo.com/ai/apple-intelligence/articles/ergono...