Look at the 50-zero wet/dry graphs in the Tire Rack tire tests.
http://www.tirerack.com/tires/tests/tes ... s/....html
Only recently have they added braking to the regiem.
ABS systems are calibrated to a certain ragged edge stick/slip ratio.......to minimize the number of brake releases per second.When a tire doesn't have the same coefficient of tire/road friction the ABS just compensates but each engagement can increase stopping distance..........each 1/10th of a second [of no braking] in a 3.5 second stop adds 9-4 feet [depending on speed when brakes cycle.
Not sure if it makes sense to buy a car that stops better than 98% of the units on the road and redesign it so that it is average or worse. But the same logic with changing brake pads to reduce dust and change stopping distances [ABS calibration].
I always believe owners would be better off ungrading the load index and going to faster wearing tires.........as one accident will negate any perceived savings.
People want the IMAGE of performance not real performance when it has a reoccurring cost. [tires, brakes, premium gasoline, alignments, rotating , radial force balancing, flipping and rotating, changing the oil, maintenance of any kind].