Status: OUT
Builder-Visitor's complete bidirectional functional duality (Builder analyzing without creating, Visitor creating during traversal) achieves full scope only while Visitor's encapsulation requirements are met — Visitor's construction capability (discretionary glyphs) demands element classes expose sufficient internal state through public interfaces, potentially compromising the encapsulation that makes the duality architecturally clean.
Visitor's encapsulation cost potentially constrains the construction side of the Builder-Visitor duality
Depends on (SL): builder-visitor-dual-structure-traversal-patterns, discretionary-glyphs-validate-visitor-as-construction-mechanism
Unless: gof-visitor-breaks-encapsulation