What we observe
Good current performance
The system behaves appropriately in the conditions under which we are presently evaluating it.
A dissociation
Current performance ≠ robustness
Looking aligned now does not tell us what the system will do when conditions change.
Two systems can produce the same desirable behavior in familiar conditions while possessing very different goals, mechanisms, and responses to perturbation.
≠
What does not follow
Robust correction
The behavior need not survive a novel situation, distribution shift, perturbation, or trigger.
Why this is easy to miss
Ordinary conditions do not reveal the counterfactual.
If nothing pushes the system away from successful behavior, we cannot directly observe what will happen when the familiar relationship between environment, goal, and action breaks.
Robustness therefore requires asking how the system behaves across variation, not simply whether one observed trajectory looks correct.
A revealing test
Perturb it.
Change the environment. Introduce an error. Remove a familiar cue. Push the system away from its target.
The resulting response can reveal whether current success was supported by a genuine corrective organization or only by favorable conditions.
Try this elsewhere