I humbly beg to disagree; it's most definitely not an edge-case as the phrase is defined.
You're using "edge-case" to mean low-frequency event. How I see the phrase used everywhere I've ever seen it, is "edge case" referring to a low-probability event, i.e. an event that is predicted to so rarely occur that it can be dismissed from consideration.
https://dictionary.cambridge.org/dictionary/english/edge-cas... says:
>> an extreme or not typical example of something, that should not be considered when forming an opinion about it:
An annual trip is an almost guaranteed event, so it's a very high probability event. I get that it is a low-frequency event, but "edge-case" is the incorrect term used to describe the event. Use "rarely" or similar instead.
System A delivering its event after system B may be an edge case.
Daylight saving time computations are not handling an edge case but a normal case that happens twice a year.
Obviously there’s people where this doesn’t apply, but there’s outliers everywhere and they’re free to continue buying gas cars today.