The people who keep systems running can't tell you they're leaving.
An air traffic controller knows exactly what happens when one person makes a split-second decision that affects thousands. A writer discovers her replacement was never introduced to her—just absent one day. Both are nodes in a network that depends on them noticing what's broken before it breaks, but neither has the language or forum to say so. The machinery works because certain people absorb friction silently, and when they stop, we discover how much was never actually written down.
Complex systems hide their dependencies until they rupture, and the people holding them together are often invisible even to themselves because the work looks like attention, not labor.
2
Stella Sacco realized she'd been replaced when she saw her replacement in code commits, not in a conversation. Michael Rejent catches departures that should have been impossible with a glance. Neither situation is sustainable because neither system documented what it actually required.
3
The next shock won't come from technology or policy—it will come from the moment we realize how many critical systems depend on people who were never asked to document what they know, and who had no formal permission to say when they were done.
Core Insight
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We've built institutions that run on competence we refuse to name, and we'll keep discovering this the hard way until we do.