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You are comparing apples to oranges here. 30-60 mph gives you no real performance indication. To truly compare acceleration times you need to do 60-130 mph rolls or 30-150 mph rolls. The acceleration difference between a 991.1 GT3 and 991.2 GT3 is significant. It will be more than 0.1 difference. This is roughly 7 car lengths in difference. Which would be a 0.5 second difference from 30-150 mph. That is hardly negligible. Imagine two long straights at a track like COTA. That is a full second lap difference just on the two straights.
Very true, lots of people today in the “have it now” generation aren't interested in spending time learning how to squeeze the performance out of the car, they just want to jump in the first time and be Ricky Bobby so they need the PDK.
So says the intermediate driver still learning how to heel-toe. It's intriguing because it's still difficult. I've been racing for 20 years. Once you learn how to HT well (about 18-19 years ago), you max out the learning curve and impact on speed from shifting. After a mid-intermediate level and HT proficiency, there's not any more performance that can be squeezed out of shifting. It's just routine downshifting under braking and doesn't impact speed unless you screw it up because you haven't mastered it. You can't brake any harder by shifting a little bit better after you are already shifting well. After that point, track speed comes from corner entry, dynamic chassis management and throttle application, which don't have a peak because the relationship to speed is dynamic, complex, and doesn't plateau (if you increase corner entry speed, you make chassis management more difficult, and throttle application varies, etc.).
On the street, I totally agree that manual shifting is more fun and involving because you can't (and shouldn't) push the car to the point where you have to engage your corner management skills (so it's fun to have something to do).