Your ignorance of the issue is appalling. Yes, a single standard, so that vendors of software and equipment KNOW they can connect to existing systems without hassle and customization. The reason the HHS needs to do it, is a) they are the senior government authority with medical focus, and b) it needs to be open, not proprietary to be universally adopted.
I suppose, with your rationale, we should have dozens of different standards with conflicting rules over the header of a TCP/IP packet...as we DID have, in the old days, where there was no single IETF standard for such details, when each new vendor of a "network" technology invented their own rules (e.g., Novell), leading to internetworking chaos. Today, unless my Specialist Physician and my Primary Care Physician are using the exact same model and version EMR system, they can't exchange data except by exporting it all (e.g., to paper) and then re-importing at the other end. One standard for all that data, from MRI results to nurses' notes, would dramatically lower the cost of medical services across multiple providers.
Standards of this kind define how thing INTEROPERATE; it has nothing to do with the screen displays, or methods of input, or some theoretical (to quote you: ..."single standard" for medical records) overarching one-size-fits-all rule.