The accidents happen a month or two later, when the real intelligences forget the change. She predicts that 2000 will start with no more than irritations. The disasters will be embarrassing and occur in February 2000. No, Y2K is calling for heroic efforts. All Fouled Up.
Most software processes are immature.
Immature software development always involves last minute fixes and twenty-four hour work days. Time pressure leads to mistakes. These may get fixed. More often the users find a way round the problems. They get fixed in the next release - may be.