A fab outage is potentially much worse
If a fab loses power unexpectedly, most "in process" work is lost and the wafers are scrap. Probably they had enough advanced notice they were able to complete all the in-progress steps (some of which take maybe a day or so) to avoid this, but we don't really know that for certain.
Wafers can take several months from the time they enter the first step to the time they exit the last step, so if you take a hit at the exact wrong time you could potentially lose 10-20% of your entire year's output even if the power was only off for a day.
Biting the hand that feeds IT
