What you said about European dates (e.g. 27/02/2021 today) is not strictly true. The rightmost character is the ones digit of the year, and it is not the larges

What you said about European dates (e.g. 27/02/2021 today) is not strictly true. The rightmost character is the ones digit of the year, and it is not the largest component. According to your rules, 01/01/2019 would be "larger" than 01/01/2021 because 9 is larger than 1. The blog post already made this observation, saying that YMD is the only format where the endianness of the date components match the endianness of the numbers; DMY does not have this property. If you wanted to sort dates correctly on the right hand side, you need to write the numbers backwards too, like "72/20/1202".