- In short
- Diagnosing rationale loss means tracing a production failure back to a missing decision-log row where undocumented rationale allowed a successor to reverse a load-bearing design choice. A successor acting reasonably on an incomplete document can reverse a decision that was actually load-bearing for compliance or another hard constraint. The diagnostic pattern is that the diagram survived the handoff but the rationale that made one choice non-negotiable did not, and the fix is upstream -- the missing decision-log row at design time -- not a rebuke of the successor.
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