I have an example of when such logic did not work.
My daughter’s prior car was 2007 Nissan Altima, which prescribes iridium plugs to be replaced at 105K miles.
It failed miserably around 98K miles, where one of the plug’ the center electrode was almost completely gone, and an increased gap made for the substantial spike in the high-voltage side, resulting in the rubber boot shot and carbon-tracking, making for the very bad misfire.
Fortunately “dad rescue crew” was only 20 miles away and made it to the store 15 minutes before closing to get new plugs… which helped only partially since carbon track was still causing misfires at idle… finally, few wraps of electric tape temporarily stopped the spark jumping and we were able to use the car for few days until the replacement part showed up.
Personally, I would rather replace plugs at 90K or so if that was on the schedule than have all this midnight hectic rescue mission going under drenching rain and with both me and her needing to get to work next early morning.