"Every control system embeds assumptions about what can go wrong.
The word assumptions is the hinge. In a simplification that makes one dashboard look better, it tells you which part of the situation is structural, not personal. That is the part you have to design around.
In a simplification that makes one dashboard look better, the phrase can feel abstract until the system bites. It shows up as a local optimization that creates global instability, where local logic produces global trouble. If you introduce a measure, name the distortion it creates, because the distortion is part of the cost you are choosing.
Erik Hollnagel is a reminder to keep it concrete. Write the hidden assumption as a sentence, then choose the signal that would break it. Be calm and explicit.