E.10.D2:13 - Rationale

The durable core distinguishes the subject being described from the claim-bearing use of a C.2.1 episteme. Each identity is recovered independently; C.2.1 permits the same episteme to serve both uses in a self-description. Specification is a checkable use of that episteme. Viewpoint selection, view membership, scope, model-use structure, grounding, evidence, assurance, edition, publication, carrier, representation, and work have different reasons to obtain and different identity rules.

Making those neighbors fields of a description tuple would erase those rules and make formality, publication, approval, or a shared context label look constitutive. Requiring all of them for every description would also make ordinary use needlessly heavy. Receiving-use-first routing preserves both reliability and economy: recover the exact constitution, add the one neighbor needed for the next action, then stop.