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I think his point might be lost in the way it was phrased. I see that he could have a point with maintenance schedules that are aggressive to the point that they become excessive. And sometimes the companies that sell you hardware push pretty aggressive maintenance packages, just like a lot of car dealership try to expand upon the manufacturers recommendations and get you to pay for expensive and unnecessary maintenance. If you accept that there is some risk of an error while performing maintenance procedures, the more times those procedures are performed, the more opportunities for an error taking place. I think that is one challenge to developing a good preventative maintenance schedule, how often is the ideal balance between preventing problems, but not so often that the odds of an error become high enough to outweigh the benefits.