C.40.DC:10 - Rationale

A contribution and its support jointly determine what a proposed change means. A course without representative practice, a model without permitted data, or a provider without a usable interface can be a relevant ingredient without being a way to obtain the contribution.

Finite changes and stage-specific baselines make hidden burden visible. They let a receiver retain a useful possibility while identifying the exact condition that prevents a stronger claim, and they prevent a gain at one stage from being counted again in every later step.