The company would probably be sued if there were any issues in one of the monthly reports; the money for the plaintiff lawyers is just too appealing. I think monthly 'informal' reports with some legal protections to allow for inaccuracies and inconsistencies, with biennial 'formal' reports would be wonderful. That said, I think allowing companies to select an appropriate reporting interval might be best.
Feels like a first world problem. If your company cannot afford to output accurate reports every month, maybe it shouldn’t be a company at all.