If you get the right spine and tune properly, you can get any arrow to fly great. The FMJ's don't fly better because they are FMJ's. They can definitely be bent.
Wheel guys love them because they don't have nearly as many misses or miss hits as trad guys and most don't shoot nearly as many arrows as we do either. therefore we are much more apt to bend the fmj's.
Besides, it is not an advantage to have heavy shafts in carbon (really any material). If you put the necessary weight up front of the proper spine and length shaft, it will fly and penetrate so much better than distributing the weight across the length of the shaft.
I hear guys say all the time that they don't buy in to that E F O C and that is their prerogative. After all, they have been doing it a certain way their whole life and I guess that makes it the only right way.
BigJIm