Alameda sits in a mild temperate band - no hard freezes, no triple-digit summers - so the failure mode here isn't a spring snapping in a cold snap like you'd see inland. It's slower: steady moderate humidity and salt air off the bay working into galvanized hardware and door seams year-round, with no hard winter to pause the corrosion.
Pair that with a housing stock centered on 1965 construction, much of it 1960s-70s stock, and you get openings sized for doors that predate current insulation standards and track geometry. A lot of these houses never had the opening reframed when the door was swapped - so a new standard-size door sometimes doesn't sit right against an original 1960s frame without shimming or a header check.
The mild climate means we're not fighting ice buildup on rollers or frozen lubricant, which actually works in your favor during install - cure times on sealant and the fit-up go faster without temperature swings. But it also means corrosion creeps quietly for years before anyone notices the track's pitted, which is usually what finally pushes a repair into a full replacement.