Most of the garages we get called to were built between 1938 and 2007, with the bulk of that stock dating to the 1960s and 70s. Openers from that era were sized for lighter wood doors, not the insulated steel sectional doors most owners have swapped in since. The motor that came with the house is often undersized for what's hanging on the track now, which shows up as slow travel, a opener that strains on the up-cycle, or a unit that just gives out years earlier than it should.
The mild temperate climate here doesn't put openers through freeze-thaw cycles or heavy humidity swings, so you won't see the rust-seized gears or ice-cracked housings that show up in colder regions. What you do see is sun. A garage facing west with no additional shade bakes the nylon drive gear on an older chain unit, and that gear is usually the first thing to strip once it's run a few thousand cycles past its rated heat tolerance.
Put those two things together - older housing stock paired with doors that have been upgraded since, sitting under a mild but sun-heavy climate - and opener replacement is one of the more common calls we get that isn't spring-related.