I'm not so sure that a torsion bar break would be catastrophic during spirited driving. I'd think that most people using the bigger bars also have the car lowered a bit, reducing the "drop" or travel in the event that one would break.
I've seen broken T bars in junkyard cars, mostly always seems to be the RH side on A body, slant six cars with the twig-like .83 bars. You know they were NOT doing 4 wheel drifts when the bar broke!