Project teams detest weekly progress reporting because it so vividly manifests their lack of progress. Projects progress rapidly until they are 90 percent complete. Then they remain 90 percent complete forever. If the user does not believe in the system, a parallel system will be developed. Neither system will work very well.
Benefits achieved are a function of the thoroughness of the post-audit check.
The prospect of an independent post-audit provides the project team with a powerful incentive to deliver a good system on schedule within budget. No law is immutable.