As been stated the real advantage is in having fixed calipers and not floating calipers. This can be achieved without 6 pistons and has been done for a long time with 4. Besides for the "cool" factor, the only advantage to 6 pots is more even distribution of the brake force to the pad leading to more even pad wear.
If the brakes can lock up the tries they are adequate for the vehicle. As long as they remain fade free.
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