“Fahrenheit is how people feel” only makes sense if said people have never used another scale. You know how 100F “feels” because that’s what you use. If you used Celsius you’d know how that scale feels instead, and be used to using the more useful scale generally.
See also: people who think they don’t have an accent.
The issue wasn’t using the dates. The issue was the computer believing it was now on those dates.
I’m going to assume you aren’t old enough to remember, but the “only two digits to represent the year” issue predates computers. Lots of paper forms just gave two digits. And a lot of early computer work was just digitising paper forms.