This is about torque and/or power curves. There are so many turbo diesels on the market today that auto boxes with lots of gears has been a necessary development to get decent power delivery over the speed range of the car because TD's have such a short rev range where they deliver good power levels. The 3200 engine and gear box are a good match as the engine in the auto is tuned to give huge torque over a wide rev range, and so the 4 speed box works well. The same auto box on jaguars V6 diesel turbo would be awful because the engine output is much more peaky. So I don't think its a case of being old technology, so much as being the right technology for the car. Personally i like the fact that the engine pulls well over a wide range of revs instead of changing gear incessantly. So put me in the yes 4 is enough camp, the car drives well so i don't see a problem?