There is a good summary post out on AudioAsylum by Rob Doorack on October 26, 2007:
For me, it's get-it-close-and-call-it-good-enough.
Jonathan Carr, the auteur behind the Lyra line, once wrote that he tried to design an arm that varied AS compensation as the arm arced across the record; he abandoned the effort when the design got too complicated to be practical.
For me, it's get-it-close-and-call-it-good-enough.