The failure modes a product team meets rather than the ones papers are written about. Hallucination, bias, injection, misuse and the quiet one, which is people trusting output further than it deserves.
A support assistant has been live for four months. Usage is steady, no incidents have been raised, and nobody has measured answer quality since launch. The team reports the feature as healthy. What is the strongest objection?
AFour months is too short a period to draw any conclusion about quality.
BThe absence of complaints is weak evidence, because most people who receive a poor answer stop using the feature rather than reporting it.
CUsage should be falling if the feature is working, since it resolves issues.
DQuality cannot be measured after launch without a control group.