Most of the houses we get called to sit in neighborhoods built between 1980 and 2007, with the bulk of that stock going up in the 1980s and 90s across the eleven areas we work most - places like Century Park, Los Reales, and the Civano side of town. That means a lot of doors and openers are original or on their second unit, and they were never built for what Tucson summer does to them.
Heat is the real driver of failure here, and this region sits in the severe end of that band. Torsion springs live on the wall right above the door, baking in a closed garage that can sit well over 130 degrees by mid-afternoon. Steel fatigues faster under repeated heat-cool cycles than it would in a mild climate, so springs rated for a certain number of cycles hit that number years sooner. Nylon gears inside chain-drive openers get brittle and crack. Circuit boards in openers from the 80s and 90s stock weren't built with today's heat tolerances, and they fail at the solder joints first.
We also see a lot of dry-rotted weatherstripping and cracked bottom seals - not a safety issue by itself, but it lets in dust and heat that shortens the life of everything else on the door.