Two fun anecdotes my mother has recounted when we were all in Denver for ~5 months in Denver 1996:
1. Asked where we were from on one occasion (after hearing an Australian accent): “Australia.” Response: “Oh, did you come by bus?” Now it is possible that there was a misunderstanding there, but mum doesn’t think so.
2. Of those that didn’t already know, only one person successfully identified where we were from, and that person was deaf. (It’s fascinating to try something like this on video without audio where there’s nothing obvious static to identify nationality: I find I can identify both Australian and American correctly at a rate considerably better than random, without ever having made a study of it.)
Yes, I could begin typing "Unite.." but we all know that ends up on United Arab Emirates, and then when I continue on to "...d Sta..." and it doesn't work, only to find out this country picker uses "USA" or something similar so it breaks the autocomplete muscle memory.
Clearly, if we're the center of the known universe, we could use our power to make it a little easier to enter my billing and shipping information.
A realistic scenario is an Australian writing French poetry while on holidays in Turkey. Now you have an OS GUI with en-GB as the language, licensing and date/number formatting as per the AU region, French spelling dictionary, a US-101 keyboard layout, Turkey as the location, and GMT+3 as the time zone.
It's a rare piece of software that can handle this. Few vendors have staff that have even heard of such exotic places.
There are still people... many people... that deny the existence of places outside of the United States of America. Such filthy, heathen locations are surely a thing of myth, or legend!
Places where dates are formatted with the days before the month, followed by the year in some sort of weird, unnatural order.
Nations that have fallen into the trap of some sort of mass hallucination, or shared dream of common measurement units. Some sort of... metric, for space, time, and matter. Maybe they've been watching too much Star Trek!
Multicultural countries where strange unions of races are commonplace, and couples may want to watch Netflix in one language, but have subtitles in a different language. Neither of which are English for the hearing-impaired! Surely, nobody but the deaf are unable to comprehend the universal English language! Not to mention that such taboo couplings are, thankfully, still banned on this stream of holy virtue and shall not be permitted by the data scientists that have declared: "Your union is a statistically negligible!"