I would not own a repainted car (unless it's a custom hotrod) as the finish is never as good as the original OEM. Should I be concerned with that here?
Until a car has been sold for the first time, it's a new car. Cars are damaged in the dealer's parking lots all the time, they have the cars repaired and sell them as new, with no requirement that they reveal the damage.
Some new-gun warranties specifically do not cover cosmetics, and if Springfield determines that worn paint is only a cosmetic issue, they may not want to fix it.
That said, they do have top-notch customer service, so I'd expect them to do the repair so the slide and frame don't rub.