My first thought was Egypt was old enough that there were ancient Egyptian scholars studying ancient-er Egypt. I could see it as a particular form of gov generally lasted that long and new dynasties etc would reset the counter. Your explaination makes much more sense.

To be fair, they used that setup first. And PS originally copied it, but for some reason switched the functions of X and O in the West. In Japan, those symbols O often used for agree/correct/confirm and vice versa for X. It is weird that X became confirm here .

I wish they’d post them more than once a year these days…