MMP.18:10 - Architectural Rationale

The general relation-composition method supplies the way to impose conditions together. Model coupling adds the construction needed when those conditions use different representations, scales or overlapping information. It makes the supplier’s result usable by the receiver.

A separate interface relation keeps three possible repairs distinguishable: change a component, change how its contribution is represented, or change the computation of their joint conditions. Without that distinction, solver adjustments can conceal a subject-model error, while a harmless numerical approximation can provoke an unnecessary redesign of the subject account.

Conservation and probabilistic coherence are different preservation questions. Their coexistence here reflects a common modeling task, not an assertion that a probability distribution is a physical flow. The appropriate mathematics remains with its governing pattern or specialist method.