A door built or installed close to 1978 has had roughly four and a half decades of open-close cycles, and most of the components in that era weren't designed with a service life that long in mind. Springs lose tension gradually, then fail all at once. Galvanized cable sheathing wears thin from the inside where you can't see it. None of this is unique to this one street or that one - it's the math of a house this age, and East Port Orchard's housing stock puts a lot of doors right in that window.
Climate plays a smaller but real part. This area sits in a mild band with occasional freeze, so we don't see the extreme cold-snap spring failures some regions get, but damp and temperature swings still stiffen grease in rollers and hinges, and a door that already has 45-year-old springs doesn't need much of a push to go from stiff to broken. It's less a single dramatic event and more a slow build that ends in one bad Tuesday morning.