I'm guessing it was cheaper and easier for them to implement Auto Start/Stop (which they already had on lots of other cars around the world) since it's an almost purely software tweak with just a heavier duty battery and starter motor. Changing transmissions would have been added engineering, build changes, and then more parts to stock, and it probably would have annoyed more owners of earlier DCT cars too. And Auto Start/Stop gives any mileage improvement to 6MT drivers as well.
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