People are gonna say "how hard is it to send a marine down there with a grease gun" or "how hard is it to R&R a major system every 20yr"
Wartime operations beat the shit out of things. Stopping a system so some marine with a grease gun can do preventive maintenance is a low priority and gets skipped when you have to go from bombing dirt farmers one day to fighting a peer the next. Systems like this is what you get when you're expected to be running a decade long low intensity conflict yet still be ready for a peer adversary.
Wartime operations beat the shit out of things. Stopping a system so some marine with a grease gun can do preventive maintenance is a low priority and gets skipped when you have to go from bombing dirt farmers one day to fighting a peer the next. Systems like this is what you get when you're expected to be running a decade long low intensity conflict yet still be ready for a peer adversary.