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Touch screens are a bad UI (User Interface) for the driver both in terms of safety and accuracy. If the touch screen is essentially vertical, your hand does not rest on a stabilizing surface, so instead of fine motor movement muscles, you use gross motor movements (arms and hands instead of fingers). The safety aspect is that more of your time and attention is taken off the road compared to an iDrive where you don't need to visually coordinate your hand (on the controller) with the screen.
Touch screens are sexy and new but they only make sense when the car is stopped or they are being operated by the passenger.
Just my 2 cents as a software guy.
Cheers,
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2010 M6 Individual Coupe (on its way to Hawaii) - it has a few nice options
2008 Mini Clubman Cooper S (I know you don't care about the options)
Ex: 2005 645Ci, SMG, Stratus Gray, Cream Beige, HUD, Race Mesh Grille, A.C. Schnitzer rear spoiler, European Delivery
Ex: 2002 745i, Saphire Black, Biege, European Delivery
Ex: 2000 528i, Sahara Beige, Beige
Ex: 1975 R90S (boy I miss that bike)
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