The service area's housing stock runs mostly 1981 to 1996, with a median build year of 1993, across the eight-plus named pockets that make up this side of town. That matters for rollers specifically: doors installed in that window came with either bare steel rollers or the earliest nylon rollers on the market, and neither generation was built to last thirty-plus years. Steel rollers wear their bearings out and start grinding. Early nylon rollers get brittle and start cracking at the stem.
Climate plays a slower role than people expect. This area sits in a moderate heat band, not an extreme one, so rollers here don't usually fail from one brutal week - they fail from three decades of the garage heating up and cooling down every single day. That steady cycle dries out plastic and works steel bearings loose faster than a mild climate would, but slower than a true desert climate would. It's a grind-it-out failure, not a sudden one.
Because so much of the area was built in that same fifteen-year window, we see the same roller failure show up on houses that otherwise look nothing alike - different subdivisions, same age hardware, same wear pattern.