Reduces the "perceived need" to (repeatedly) overtorque wheel nuts, which reduces clamping force, increases the frequency of nut, thread and stud failure and replacement, and can result in cracked wheels - each of which increases the risk of fines, additional wheel/component damage, and wheel separations.

Stops wheel nut back off during periods of differential thermal contraction, which results in permanent loss of torque and clamping force.

Protects nuts and threads from salt, sand, dirt, and other contaminants.  Reduces the frequency of settling effects and false torques (increased risk) caused by rust, damaged threads, and unclean mating surfaces, or the labor required to maintain these components in clean and proper assembly condition.