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Now think what the newer vehicles will need with all the additional electronics!
Irreverent, the alternator the manufacturer installs is quite capable of providing adequate energy to run all these additional electronics and more, the real problem here is smart charging which often leaves the battery in a partial state of charge for extended periods, this shortens the life of the battery. Disconnect the sensor attached to the neg clamp of starter battery and the battery will get a full charge and last much longer. Try it, if not happy just reconnect it.
Maintaining increasing levels of ECU's when the vehicle is off is not dependent on the alternator.