This is still not an ordinary failure by your definition of it being a single point that failed. It’s was like half a dozen “things” that went wrong for that plane to get into the air without those bolts. From not putting them in, to missing inspections, missing cross-checks. Sounds extraordinary to me. Which is the whole point of why it’s a deeper issue, showing systematic problems at Boeing and it’s partners, and the FAA not doing it’s job, too.