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.