The reason maintenance matters more here than it might somewhere with newer housing is simple: most of the doors we work on sit on houses built between 1949 and 1993, with the median right around 1967. That's original hardware on a lot of doors, or hardware that's one replacement removed from original - torsion springs and track brackets that have outlasted the roofs above them.
Add the climate band this area sits in - cold moderate, with real winter cold and real summer heat - and you get metal that expands and contracts twice a year, every year, for decades. That cycle is what loosens track bolts, dries out lubricant, and fatigues a spring faster than the same door would wear in a milder climate.
Across the wider service area, 21,303 of the 34,040 households own their house rather than rent, at a median household income of $61,160. That matters for maintenance because owner-occupied houses are the ones where a door gets fixed instead of ignored until the next tenant complains - which is part of why regular tune-ups actually get scheduled here instead of skipped.