A severe cold climate band means two freeze-thaw seasons a year working on steel panels, torsion springs, and track alignment. Cold steel contracts; a spring that was fine in July can bind or snap in January once the metal tightens up around a worn bearing. Houses built around 1985, which describes most of Darnestown, are now coming up on 40 years of seasonal cycling on their original hardware if nothing's been replaced.
The other pattern we see in higher-income pockets like this one, where median household income runs well above the wider service area's $154,514, is that doors get cosmetic upgrades - new paint, new insulation kits - while the spring and cable underneath stay original. A door can look updated and still be running on 40-year-old torsion hardware that was never on anyone's replacement list because nothing looked broken.