Audits are easily done on transparent chains which however leak nearly all the transaction details.
Dusk aims at the most difficult intermediate territory. Construction of conforming privacy necessitates demonstration of properness without disclosing crude information. That incorporates cryptography, rule logic and operational limitations most chains shun.
This, practically, implies 30-40 times the complexity of the system than transparent designs do--but it permits the unsanctionable to be verifiable: privacy. Dusk is created on the hypothesis that financial systems of the future will not be 0% privacy or 100% opaque but will selectively be provable through design.