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Touch: It’s in the way that you use it.

image In previewing some of the features of the next Mac OS, code-named Lion, today, Steve Jobs decried the idea of using a touch screen on a notebook. Apple’s CEO cited the ergonomic burden of having to constantly reach forward to touch a vertically oriented screen and said that the proper orientation for a touch surface is a horizontal surface. Hence, Apple is expanding the multitouch gestures invoked from input peripherals such ad the MacBooks’ trackpad, Magic Mouse and Magic Trackpad.

However, the iPad is not generally used in a horizontal orientation — just check any of the Apple Pad billboards. There is a bit more to the story than just orientation. First, despite the iPadian nods to touch manipulation Apple is planning in Lion, desktop operating systems simply are not designed around the same kind of large on-screen UI elements and design that characterize the iPad experience.

This becomes obvious on a touchscreen Windows system long before arm fatigue sets in. (If you don’t have a touchscreen Windows system but do have a Winsows PC and an iPad, you can test this by using the Splashtop Remote Desktop app or any number of screen sharing alternatives.) Apple could, as many PC makers have, tweak the controls, but then the apps would still be a UI generation behind stuck in the traditional paradigm a on Windows

Second, the iPad is far more of a passive consumption device than a Mac.I’m not sure how many touch gestures the average iPad user makes versus mouse movements for a Mac user, but I would guess that the latter number is generally much higher. So even if. Apple were to create a Mac slate and tweak the UI elements, using such a computer would not be the smooth, gentle experience of an iPad.