Yep and he was wrong, NO ONE uses their laptop like that with the arm outstretched all the way out. And FYI yes I am an expert who has treated hundreds and hundreds of RSI patients over the years. The trackpad is what is an issue with RSI injuries, having your hand contorted all day long is an issue, worse IMO than using a mouse which has its own RSI injuries. I suppose if you are a moron like whoever's arm that was in the video, and you use your arm fully outstretched like that for hours at a time you deserve the arm and shoulder chronic injuries you will incur.
Again, no one uses their arm outstretched like that, it's like the other inane myth that people use their iPads standing up at arm's length. Touch on a laptop is simply meant as something to be used IN CONJUNCTION with your trackpad/mouse, not exclusively. Although on something which can lay flat, and/or be nearer to the user you could use touch exclusively very easily, in fact it takes away a layer of abstraction in that you are putting your finger on something versus abstracting to a mouse pointer. It's also more convenient sometimes to sit closer to your laptop, making touch a better choice than the trackpad, I think of my morning breakfast with my tablet where I can just use my finger to scroll and click through the news. But all of this goes away anyway when you consider 2-in-1s and tablets.
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