HH is making a valid point. I offer my thanks for bringing this to light, and though I rarely use a stiff steel rod for loading muzzleloaders, I do occasionally. And I will keep this thread in mind when I use one or see someone else doing so.
I have only witnessed this phenomenon once: a terribly hot day, after hours of shooting, shooter charged from his measure, and sent the ball onto the powder in one quick pass with his ramrod, having placed a wooden knob over the end first for hand comfort. It was a 28" T/C barrel, and the charge shattered the rod and gas cut his upper hand severely.
Complacency, here, is the devil. So pay attention, and don't dismiss other's philosophy out of hand.