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And so are Lewis Hamilton, Jenson Button, Fernando Alonso, et al - but they only have two pedals (one stop and one go), and change gear with flappy paddles! 
Get in the real world!! for the last time the dsg box is not the be all and end all,
Really? 
So why does the 1000 horsepower Bugatti Veyron ONLY use a DSG? And why have Porsche developed their own version of the DSG - aka PDK? What about the Mitsubishi DCT?
These are all dual-clutch automated manual transmissions! 
There are plenty of reasons why Formula 1 cars all have the flappy-paddle systems, it's all to achieve the maximum performance from the machine. As well as increasing acceleration and more time by the engine applying power to the wheels, the convenience for the drivers just having to press a button to change gear rather than having to physically move their hand from the wheel, wiggle a stick then move it back to the wheel to take a corner or whatever other move, it allows the drivers to concentrate more on the general job of driving and racing to finish first.
When talking about mere consumer level cars that mortals like me to drive, it's going to be more of a comfort and convenience thing, as well as another big factor which is financial cost. DSG costs over £1000 more than manual on a GTI. For people like me who haven't got £1000s to spend on additional features, it's something to consider not having. After all, some of us are just after a nice car that's practical and comfortable and not wanting to cane the pants off it. And most of us know how to drive manual anyway and we're used to it so why have to change habit? I agree with the previous poster, DSG isn't the final thing in gearboxes; wiggling the stick still has simplicity and familiarity going for it, I think for lots of years to come.