Housing across this area was mostly built between 1945 and 1988, with the bulk going up in the 1960s and 70s across the eleven neighborhoods we cover. That means a large share of garage openers out there are either the original units or a first replacement from decades back - chain-drive motors with steel gears, mechanical limit switches, and wiring that predates anything with a safety reversal sensor built in.
The cold is the other half of it. This is a severe cold climate, and an opener that sits in an unheated or barely-heated garage spends four or five months a year cycling through freeze-thaw. Grease in the gear housing stiffens, the motor has to work harder to turn the drive gear, and that extra strain is what finally snaps a tooth off a gear that's already thirty-plus years old. Newer belt-drive units handle cold better, but a lot of the housing stock here was built and wired before belt-drive was standard, so swapping in modern hardware usually means some rewiring at the wall switch too, not just a motor swap.