Depends how picky you are. Most Autopians would probably think that even a "nearly perfect" car could benefit from an overall polishing, but if most of it is "good enough" then sure, only spot-correct the obviously bad areas.
You could always do the bad spots and then incrementally do the rest of the car as time/etc. permits.
Note that I don't consider SwirlX to be different from any other abrasive polish, even though it might be marketed as more of a "spot-correction" product. IMO if the exact same product came in a gallon jug nobody would think it was any different from any other medium-mild polish.
