The failures in my systems still hide until they don't, same as always. What changed is me. I used to swing between shrugging off the risk and being frozen by it. Now I design with a steady, humble care, respecting what I can't see without letting it run me. I do the work well, accept I'm not all-knowing, and go home.
More people experience this than they realize.
You design for hidden failure with humble discipline, neither reckless nor frozen by it.
If this sounds familiar, the Library can help you find the bigger picture.