I tried to push ISO to my (US/EU) company many times... it just doesnt work because you only need YYYY once in a while. Instead, we've settled on NATO formats (another US+EU org): 3 Nov 21 or just 3 Nov. It's unambiguous and short --yes, harder to parse and sort, but those are computer problems, always easier to solve than human problems...
"3 Nov" is ambiguous, it could mean 2020-11-03 or 2021-11-03, or any other year. And by the way, "3 Nov 21" is also ambiguous, it could be 2021-11-03 or 1921-11-03. Lots of stuff happened in 1921.
Also, "3 Nov 21" works only as long as everyone speaks a language in which "Nov" actually stands for November. Abbreviations can have false friends in some languages. It's the reason most EU personal documents try to avoid using text as much as possible because it's impractical to write it in 20+ languages.
