Date fields are decimal numbers since a certain date, not text, aren’t they? That’s why different formats work. How formatted only a detail how presented? Or am I wrong on that? I did a test in DEVONthink and that’s how it seemed. That’s how databases and spreadsheets work. So presentation format shouldn’t matter, if someone uses a text field and puts in a date, then it will sort per the text not date.
In any event, I always use DD-MMM-YY format with the month written out as I’m frequently confused about 10/2/23 vs 2/10/23 is or is not the same date, and then because many of us lived through the Year 2k “crisis” even “23” without a century prefix causes confusion.