Fair comparison
Universal Document vs DOCX
DOCX is a strong authoring format. UD adds explicit document-state semantics, lineage and portable integrity concepts around the content.
Not a forced replacement
UD is designed to coexist with established formats. The practical question is which object should carry structure, state and lineage, and which formats should remain compatibility exports or required delivery formats.
Evaluate with one real workflow
Compare how each approach handles revision, finality, portability, machine readability, provenance and recipient friction.