Actually, there is a well correlated factor "Steering Work Gain Sensitivity" that Ken Norman references in his paper:

K.D. Norman, Objective Evaluation of On-Center
handling Performance, SAE Paper 840069, 1984.

In fact, I believe this was originally developed in Sweden by a car manufacturer there. In my experience, the 'Optimum' work sensitivity for race cars is almost the same as that for passenger cars. The g's are factors of 2 OR 3 different depending on the series, but the manifestation of balancing a high gain car with high effort and a low gain car with low effort still applies.

All it does is metrify the notion that maneuvering takes work and the amount of work should accomplish the same goal no matter what the steering system is. High numbers are nimble and darty, low numbers are sluggish and heavy. A perfect pleasing balance can be objectified. The metric drives power assisted steering in all production cars if they want to please customers.