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There is a concept in maintenance where people think if you maintain a thing more it'll always get more reliable, but in reality even skilled practicioners can take something that worked and walk away with something that doesn't work, so you have to balance the risk of failure with the residual risk of maintenance. More often than not, you just let the failure happen because you can't mitigate some risks and by trying you introduce more risks. By understanding this you can do less maintenance and get more reliability.

I've always applied this logic to medicine as well ...