I'm pretty sure that Walter Röhrl is 3 seconds faster on the Nordschleife in a LSD equipped manual operated 997 Turbo. 3 seconds on a 20 km track. Done by a professional driver who 1. took a major role in 997 Turbo development and 2. knows the Nordschleife like his own bedroom.

I still think that a non-professional driver would profit from Tiptronic more because keeping both hands on the steering wheel is a major advantage for the "average Joe" (oh boy, do I love this expression... ) driver.

If you consider yourself a pro like Walter, then so be it, I agree with you. But then you need to get a GT3 RS and not a GT3 or even a Turbo. To use the words of a friend: AWD and PSM are for pussies. Of course I don't agree but you may actually like this statement.