You sure work hard on the equipment. Can you tell whether it's actually necessary, or does it just make the owner feel better for having done it?
This reminds me of Navy maintenance systems where we used to dismantle a seawater pump every two or three years just to inspect and replace parts that had a history of wearing out. You veterans know that the mere act of dismantling the pump caused more chaos, confusion, and disruption than any of the failed parts would have caused. Then there was the thrill of getting it back together, to say nothing of the expense of fixing everything else you accidentally broke along the way.
So during the '90s the Navy moved to "performance monitoring". Instead of tearing apart a pump to see what might be breaking, its performance was tested: max pressure output, max volume output, transducer readings on various bearings, other signs of impending trouble. Lo & behold, when you don't have to fix a pump until it's breaking then it goes longer between teardowns, it lasts longer overall, and you do a lot less work. I can't remember ever having a seawater pump seize up on us, even when the harbor water was filthy enough to clog the suction.
So why lubricate all of those hinges & latches every year? Why not two years, or five, or 6.237, or just wait until they start making noise?
Another case in point: "washing" a car. I haven't washed a car since our daughter was tall enough to reach the roof on her own. Our cars get washed once a year: on Mother's Day and Father's Day. When she graduates from college, I suspect that's going to stop. I think our 2006 Prius has been waxed once in four years. It's seen more surf wax on its roof than car wax.
Yet I haven't had anything rust out on me since my first car, a 1981 Mazda GLC, started getting roof rot in the 1990s. (Ironically that car got washed a lot.) Today's car coatings seem pretty advanced, and I can't tell that washing & waxing make a difference. Let alone Family Handyman advising having a special car soap and a separate rinse bucket for the wash mitt.
I can see the wisdom of hosing off road salt or clumps of dirt/tar. But even there I'm skeptical that it needs doing as frequently as advised.
I'm encouraged by the trend toward 10,000-15,000-mile oil changes. I like the idea of 30,000-mile air filters, 100,000-mile spark plugs, 100,000-mile radiator coolant, and brake pads that only need inspecting every 100,000 miles.
If you want to have a showroom-ready car, that's a passion. To keep a car alive if it was built before the 1990s, it's probably a necessity. But before I do most of this maintenance on a modern vehicle, I'd want to know how it improves the performance of the car or prolongs its life. I bet most of the time the difference is insignificant.