Yes 9 inch rears have many advantages when it comes to the things that have been referred to. Who uses their pro touring car in such a manner that the likleyhood of blowing it up is really there? Are these pro touring cars yanking the wheels of the ground in 1/4 mile drag racing? Check out
www.rhodescustomauto.com and that camaro has a 1.3 60' time with a 12 bolt. Does anyone with their street cars stress their rears more than that? If your car blows the rear on a road trip who is actually going to do the that kind of work on the side of the road or in a parking lot? I don't know anyone who would. It would be trailered back home no matter what kind of rear blew up. Besides, how many people with 9" rears in their street car actually have a spare center section already set up and ready to install in the event a rear blows up on a road trip.