Principlev1
Replace schemas when the framework cannot formulate
Replace schemas when the framework cannot formulate questions that reality demands, because inability to express necessary questions reveals incommensurability between model and domain.
Why This Is a Principle
Derives from Linguistic Structuring of Thought (language structures thought), No Direct Access to Reality (mediated access to reality), and Scientific Paradigms Are Incommensurable (paradigm incommensurability). When a schema's linguistic and conceptual structure cannot express critical questions, the framework itself is the constraint.