One thing I've learned listening to SJ all these years... no technology is good enough until suddenly it appears in Apple products.
One of my favorites was Jobs' claim when the "luxo" or "makeup mirror" Imac G4 was introduced.
He said that CD drives won't work in the vertical orientation, which was why the Imac G4 had the CD in the tacky white plastic half-dome instead of the screen.
Of course, they worked just fine in the vertical orientation in the next iteration of the Imac

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The makeup mirror Imac has another parallel with the latest introduction....
A big thing then was made of the engineering in the swivel arm - how hard it was to engineer a great solution.
Now Apple is crowing about the wonderful unibody frame - but the former Apple fanbois say "where's Firewire - we want features, not a less useful system that's a millimetre thinner than the last one".
I now have the strongest urge to 'touch' the screen on my desktop work computer to select options and press internet buttons ever since I got an iPhone (actually did touch it a few times!) ... never had the urge on my laptop, though, which I usually use sitting down in bed (so a very different posture). So, I think in some cases the 'touch screen' would possibly keep your focus on the screen and you'd not have to break stride and look down at the keyboard or move your hand on the mouse which is energy 'away' from the focus area (the screen). It seems so 100% natural to me after just a few months with an iPhone to touch that screen to make things happen!
There might actually be some human factors evidence that it is beneficial as well...
BINGO!!
I have a touchscreen Windows phone, a Chumby, and a MID that I've been playing with the last couple of months.
And yes, I've been poking the screen on my laptop and desktop just out of reflex.
I think that the key isn't that you need to redo the whole UI to be touch-only, but that a touch should be equivalent to a mouse action. If there's a big button on the screen that says "[OK]", let me tap that with my fingernail rather than finding the mouse or touchpad and moving the cursor over the button and then do whatever is interpreted as a "click" (Apple has really muddied that one with the new Apple books)
I don't have to use the whole-arm action for everything - but please make tapping the "[OK]" button the same as moving the cursor over the button and clicking.
But "choice" - it's not an Apple thing.