As far as I know, the most immediate effects of normal-ordering is the elimination of the zero-point energy (and the zero-point background of any conserved charge) and the elimination of tadpoles in perturbation theory.
In SUSY the zero-point background of all charges is zero, and (in the theories I've studied) there are not tadpoles either. So it seems that normal-ordering is essentially effectless. Is this true to all practical purposes, or is there some point where normal-ordering is useful?
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