Jobs 在 2010 講過，桌機/筆電螢幕加觸控，人的手要一直抬起來碰螢幕，是非常不自然，也很累。
人類手臂懸空不是自然長時間狀態。
尤其 mac 是長時間工作設備。
https://www.businessinsider.com/steve-jobs-touch-screen-mac-2010-10?utm_source=chatgpt.com
其中有一段：
Steve Jobs 原話（Business Insider 引述）
"We've done tons of user testing on this, and it turns out it doesn't work. 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. It doesn't work, it's ergonomically terrible.
Touch surfaces want to be horizontal, hence pads.
For a notebook, that's why we've perfected our multitouch trackpads over the years, because that's the best way we've found to get multitouch into a notebook.
We've also, in essence, put a trackpad -- a multitouch track pad on the mouse with our magic mouse. And we've recently come out with a pure play trackpad as well for our desktop users.
So this is how we're going to use multitouch on our Mac products because this (he points at someone touch laptop screen) doesn't work."
所以 Apple 那時代的核心思維：
觸控是「近距離、低臂負重、躺著座著都可以用」→ iPhone / iPad 適合
鍵盤螢幕分離的筆電模式 → 長時間手抬起來觸控會造成「肩頸、手臂負重問題」
這是為什麼 Jobs 超反對把 mac 做成觸控螢幕。
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