The climate across this service area sits in the mild temperate band, which sounds easy on hardware, and mostly is - no hard freezes to crack plastic housings, no deep cold to stiffen grease. But mild and humid is still humid, and humidity is what rusts a galvanized cable or pits a spring coil over enough years.
Combine that with the age of the stock here - houses from around 1984 mean springs and cables that, if they've never been serviced, are approaching or past the point where metal fatigue starts to show. An extension spring doesn't usually snap without warning; it stretches a little more each season until the coils are visibly uneven side to side. That unevenness is often the first thing we're called out for, well before the door stops working outright. Lubrication slows the corrosion side of it, but it doesn't reverse spring fatigue, and a door that's already stretched its springs thin needs them replaced, not oiled.