I must admit I'm not surprised about the +ve review from Chris Harris. Based on the Porsche's "success" with the 997 GT3 cars, I had faith that they would not take a step backwards with the new 991 GT3.
I think Harris makes a very good point about different people's feelings towards the 991 GT3:
Factually and objectively, the 991 GT3 is better than the 997.2 GT3 in every almost way. It is faster, it is more capable on road and track, it is "easier" to drive fast, it will be a more convenient daily driver in traffic, etc, etc.. The new engine sounds wonderful and revs higher than before. Even the recalibrated electric-mechanical steering rack feels awesome, the rear wheel steering is not intrusive and makes the car more agile, and PDK is "involving" and "fun" while being lightning fast in its shifts.
Philosophically, the "purists" have a problem.......because a GT3 is "supposed" to have a MT, a GT3 is "supposed" to have a Mezger engine, a GT3 is "not supposed" to have things like PTV and RWS (but power steering, power brakes, ABS, traction control, stability control are OK....

). The purists would rather give up performance for the control, feel, challenge, and satisfaction of skillfully changing gears with a clutch and master the heel and toe technique.
After owning a 6MT 135i for the last 5 years, I can understand the satisfaction that comes with shifting gears manually with a clutch and mastering the heel/toe technique on road and on track. As I have never owned a any 911, I have no "history" or a list of what a GT3 is "supposed" or "not supposed" to have. My perspective is the following: the 991 GT3 is probably SO MUCH better as a performance car than any of my existing cars, and that owning a 991 GT3 would be a mind blowing experience such that the lack of a MT would be a mute point. I also feel that for such a high performance car, having PDK would be the "safer" option for tracking, as I can concentrate more on all the other things when going at high speeds. And with the PDK, I still have 100% complete control over gear selection at all times.