i have yet to hear of a failed wheel during auto-x, I'm sure it's happened and someone will correct me I am sure, but to me, wheel failure is more likely to happen on the road with huge potholes and other obsticles.
i think what is going on is some of the Porsche "purist" get bent out of shape when someone mentions a cast wheel and then say's "get a Fuch, they are forged and the best" Mostly this happens when a 4-lug Fuch knockoff is talked about
....it seems that someone says that the cast wheel is excatly the same thickness and overall dimensions of the forged wheel and that a cast wheel "has" to be thicker than the forged original..well, yes is should be, but is it just an assumption that the cast Fuch-knockoff is 100% identical??
guess what? I've got a broken forged Fuch in my garage with no visible signs that it hit a curb or anything.
Another thing, not many wheels are forged at all, if cast wheels are not allowed, then you'd piss off everyone running 944, 951, 911, 993 and 996 rims