Patient data is not special other than its security requirements. There does not need to be a layer of standards in this space dedicated to handling/transfer of clinical/hospital data between organizations. Private industry & hospitals can solve this without the need for a standards board or HL7 standards. We have enough standards for handling/transfer of sensitive data.
Engineers have already solved that with interoperable data systems dedicated to managing and sorting through large sets of data. Healthcare data is simply data. There are plenty of other types of highly sensitive data that don't need an entire organization dictating bloated standards implementations that are already highly fragmented themselves.
HL7 is an unnecessary abstraction.