It's not so much that a problem happens once a year, it's that 20 or 30 things each fail once a year on their own, and many of them in-turn cause failures in other things, so if the Rube Goldberg of devices and processes that have to work each morning are interrupted partway through, it starts adding unnecessary stress to the individual. When each device operates independently of the rest then the failure of the coffee maker isn't that big of a deal, but if individual has spent a lot of money to make everything just work, and everything doesn't just work, it's aggravating and it sets the tone for the rest of the day.
Back when I was paid hourly, parking at work was a huge problem, and one was expected to park before clocking-in. The hourly employees were left angry every single morning due to this, and morale at the office was unnecessarily low. Worse, those that could address it were not hourly and had assigned, enforced parking, so it was not a problem for them. They never could understand why their employees were always in such a bad mood. It was a disconnect that has never been fixed.