MATH.9:9 - Consequences
A fixed-output calculation can prevent work on an impossible selector and identify what information or output change would make it possible. Where a compatible answer exists, the orbit construction turns it into a reusable rule for related inputs.
Different representatives can support different valid rules. Their evaluation cost, continuity and usefulness for a receiving task can differ even when each satisfies equivariance. The mathematical construction supplies a comparison basis; the receiving requirements select the rule.