I find DMY and YMD more logical, because you start out with, or end with the most or the least significant unit. The unit in the middle is always neither most or least significant then. So, to me, that's more logical. Of course, yyyy is still preferred to avoid confusion with 2 yy digits.

Well that took some time before my neighbours to the south saw this.

To be fair, no one said people who use either MDY or DMY are idiots but that one form was less idiotic than the other. Hence my question: why?

My take is that both forms are not logical when written since it becomes ambiguous on the first 12 days of any month and only for 11 of those days as in: what is 03/02/2021 as opposed to 2021/03/02?

Of course when speaking you use the convention of the language. Even the Brits who use DMY say October 3, 2021 but not the French.

My 2 cents:
Here's a line of text from the stdoutdae.txt file in one of my current Windows 7 BOINC data directories, which would have been written by a BOINC client boinc.exe program:
01-Oct-2021 04:40:22 [---] Starting BOINC client version 7.16.11 for windows_x86_64

That is Australian Eastern Daylight Time, UTC+11, and I automatically feel what it means. The format used in your stdoutdae.txt files may be different.

If at WCG you get around to modifying time and date formats, on every page where time is displayed PLEASE show somewhere on the page the timezone used, eg "Times are your local time" or "Times are UTC".
- HTH