Two things stack up against single-panel repair here: age and weather. With most door stock across the 16 named areas in this territory dating to the 1960s and 70s, a lot of what we're pulling off a job site is original hardware on original panels - steel that's been through sixty winters of expansion and contraction. This area sits in a COLD severe climate band, and that matters more for panels than people think. A panel that just dents in a warm climate will crack along the seam here, because the steel's already brittle from decades of freeze-thaw cycling before the impact ever happens.
That combination - old stock, hard winters - means damage shows up differently than it would on a newer door. You're not usually looking at a clean dent that pops back. You're looking at a split seam, a bowed section, or a panel that's pulled away from its hinge because the metal around the screw holes has fatigued. None of that is cosmetic once it's there, and none of it gets better left alone.