My take on it was that they should be able to if you drive/launch proper. You think people should upgrade them first. Not a bad idea. It doesnt conflict with my opinion. I just think the stockers could pull it off.
Personally I will just replace one if it breaks. Its unlikely that breaking an axle is going to damage any other part on the car, so thats a $2000+ upgrade that I do not mind waiting to spend until it is a problem. But I am not trying to stop anyone from upgrading them first if they feel it is unacceptable to run the risk.
BTW when I saying that DSS axles break just the same... I was refering to people I have known that broke the other levels in a 350z/G35. All they offer for the 370z is their "Pro-Level" setup, which I have never personally heard of anyone breaking. So for as far I know, the only solution they list for the 370z may be "bullet-proof" for the most part.
The Driveshaft Shop | NISSAN 2009- 370Z / G37 1200HP Pro-Level Axles - 370Z / G37 - Nissan - Import Axles