That list includes things like the "British Regnal year" and its mostly historical calendars that aren't used at all... The real items on it are almost all ceremonial calendars and everyone (who isn't a priest) uses the Gregorian calendar, or at least most people know it. It's the obvious choice for the standard, I'm not sure why people are pretending it's not.
Notably, the newest entry on that list is "Unix time". Just because there's already more than one entry on the list doesn't mean a small group of people should add another. That's not even "there are now 14 standards" that's just deliberately adding to the pile.
> The real items on it are almost all ceremonial calendars and everyone (who isn't a priest) uses the Gregorian calendar, or at least most people know it.
Isn’t this just the “no true scotsman” defense, but for calendars?
Notably, the newest entry on that list is "Unix time". Just because there's already more than one entry on the list doesn't mean a small group of people should add another. That's not even "there are now 14 standards" that's just deliberately adding to the pile.