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I guess you're right. A catastrophic failure is a cracked inner ring leading to loss of pressure. A maintained shock/fork is likely not have that issue.
I guess as long as I do a quick oil swap and seal inspection/swap before big trips it should be fine. Fox does specify 25hr service intervals, but I've read plenty of stories where people push past that without much issue. I make sure I clean stanchions, add a line of oil to the seals and cycle the forks/shock to push dirt out. Should be enough I guess.
Try not to think about how hideously complicated modern mtb hardware is
I suspect your hydraulic disc brakes are more susceptible to catastrophic failure than an air Spring although some solo air implementations have terrible design flaws - I'm looking at you Cannondale