Two things drive new-door calls in Dell Rapids more than anything else: the age of the housing stock and the winters. A door built around 1990 is past the point where replacement parts for its specific track hardware are easy to source, and the steel itself has had thirty-plus winters of freeze-thaw cycling at the bottom panel seam.
This area sits in a cold, severe climate band, and an uninsulated 1990s door simply wasn't built against that - the foam core, where it exists at all, has usually degraded to the point it's doing nothing. Homeowners here tend toward higher household incomes than a lot of the surrounding towns, and we see that reflected in the calls: more requests for a fully insulated door with a tighter R-value from the start, rather than a bare-minimum replacement.