docs: added further aspect

Author: mfranzke

.github/copilot-instructions.md

@@ -133,6 +133,7 @@ When working with CSS if() functions, always follow the official WCAG specificat
 2. **Always** add fixture tests for new CSS functionality
 3. **Always** run the full test suite including browser validation
 4. **Always** update documentation when changing public APIs
-5. **Consider** performance impact on large stylesheets and DOM trees
+5. **Always** bear in mind that the developer's main job is to read, not write, code. Therefore, avoid unnecessary complexity, abbreviations and short forms of parameters, for example in CLI usage.
+6. **Consider** performance impact on large stylesheets and DOM trees
 
 This project aims to provide a complete, specification-compliant implementation of CSS if() functionality for browsers that don't yet support it natively.