I wonder if there is any objective statistical evidence based on a large enough sample to be meaningful that carbon bars are any more prone to JRA failure than are alloy bars. If someone could point me to such a study, I'd really appreciate it.

In the meantime, every time this topic comes up it seems we get a lot of personal anecdotes one way or another but no real data. I've used both, taken the same care with both (yes, I own a torque wrench), and had zero issues with both. But that doesn't prove anything.