Writing, organizing, and structuring an agency or department's web content takes specialized skills that the guy in the end cube with spare time likely doesn't have. Agencies need to dedicate resources with the right skills—writing, customer service, UX—to build, maintain, and manage web content. It's a full-time, ongoing job for an entire team to keep an agency's content current and accessible.
Best practices are not a secret. It all boils down to setting priorities and funding them. With reduced federal spending imminent, managers must set forth clearly understood, mission critical programs they can fund and staff with qualified employees to get the job done.
While we would all love to drive the high-end luxury model, we may have to accept something we can afford.