Here is the problem with bundling hardware with a software innovation.
1: If it is at all proprietary, it'll limit the usefullness of the innovation. There are countless examples of a "paired" hardware-software solution where the hardware has a limited scope and the software needs that hardware. This is expensive and inflexible and tends to fail.
2: Bundled hardware tends to drive up the cost of the software, and frequently the best SOFTWARE innovation doesn't come from the same company best suited to make the best HARDWARE to leverage that innovation. So you end up paying more, you're forced to buy a component that is less than ideal, and you end up going out and buying an aftermarket product anyhow.
I mean - there are all kinds of examples of this going on even right now. The Wii U comes in a basic set that is less expensive and has NOTHING bundled in it. You pick your game, you pick your accessories, you go out and spend on the aftermarket devices you want. It'll probably cost MORE or you'll have LESS satisfaction out of the box... but it is an option.
Or you can get the deluxe version. It comes with a cradle for the tablet portion, a stand that charges, a bundled game, and some other accessories. It costs a little more, but it has everything you need right out of the box - but you probably could get better accessories from a 3rd party vendor once they're available.
Pick your poison. This is all marketing.
In the case of a retail Windows 8 upgrade - the idea is that you're pretty technically savvy if you're doing this. You don't want it to come bundled with a touch-mouse or a touch-monitor... you want to pick among your well researched and favorite solutions from multiple vendors.
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