C.29.BB:9 - Consequences
A well-constructed boundary can remove the need to know complicated internal exchanges. A second boundary can locate where missing storage or transfer information matters. The same construction supports physical balances, defined counts and numerical preservation tests.
The total compresses information. Local capacity, spatial extremes, causal response and completion time can remain unresolved even when the aggregate balance is sufficient for its own question. Retaining the component account makes those further inquiries possible.