Ackerman is a perfect example of something that's of some relevance to low powered Formula cars (Formula Vee, Formula Ford) and Sports Racers (Spec Racer Ford, S2K) where momentum and low rolling resistance is important. Some of the low powered Production racers (HP, GP) also spend some time optimizing steering angle on their cars.
But its unfortunate that amateur IT and GT level road racers discovered the term in the racing books. Its taken on a life on Internet wholly out of proportion to its value to a a production sedan based racer. Pages and pages are devoted to the trivial minutia and optimizing steering angle to minutes of arc based on the turn radius, steering angle, and estimated tire slip angle.
This thread has basically become what I call an Internet Engineering Masturbation exercise. You guys have lost all perspective.