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It does appear it was designed to help with shifting and sudden braking.
The internals of your alternator spin at the same rate as the motor, but when you shift the rpms drops can been in the range 2k-2.5K if you "racing" the motor. While its easy for the engine and trans to handle this situation, the alternator driven by belt cannot adapt to the load change. So some of the momentum in the rotating assembly is absorbed by the belt or into the electrical system. Thus shorting the life of the alternator and belts.
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