Well I'm as far as you can get from an expert.... but from what I know from my old days of drag racing traction bars are designed to prevent axle wrap and wheel hop... those happen when the torque at the rear wheels causes the axle to go the opposite direction of the tires. Tying the rear axle to a pivot point in front keeps the driveline straight and transfers the tendency to wrap to front lift in high traction environments....
My guess why you don't see them discussed here is we don't have much of a high traction environment.... excessive torque/power will just spin the tires...
You didn't mention how much power you are applying.... or how stiff your rear springs are... or how your axle is located... all of these things could change the answer, you still need the axle in alignment to the driveline at top speed when the maximum power is applied.
If you are looking toward a Mile event, then you might want or need something to keep the axle from twisting.