Yes, I understand where France is relative to Switzerland. But the basic fact remains that not one of the developers or testers or stakeholders encountered this, and it was so rare apparently the very first person to encounter it -- given that it was literally a blocking issue, and not just some transient issue -- is the linked article.
Is it a regrettable bug that made a poor assumption that breaks in special cases? Sure. Is it "Dunning-Kruger" (groan), or some demonstration of how stupid the developers are? Give me a break.
The Dunning-Kruger thing wasn’t meant to disparage the developer and certainly not to call them stupid. It’s simply a reflection on not knowing what you don’t know and thinking you know more than you do. Everyone goes through that.
> apparently the very first person to encounter it
We don't really know that.
It may have been the first person able to complain - given you couldn't even file a support ticket without getting through this prompt!