Actually,  I spent two years in New York City in 1998 and 1999 preparing for Y2K.  Elevators were on a two digit date.  Imagine the issues if the elevators failed?  Also, I was a speaker at training sessions for IT professionals, lawyers, doctors, and accountants regarding the real (and fake news) risks posed by the date change.  Of all my clients, the only ones that had issues were law enforcement (specifically County offices), and those problems were within specifically programmed applications provided and customized by large entities.  All other aspects of technology environments we successfully mitigated.  The date change potential for problems was very real.