Apple Health successfully scrapes my medical records from multiple health systems (as well as Labcorp) using OAuth authenticated public API endpoints provided by their Epic EHR instances. I'm somewhat optimistic because of this. The technology implementation was not the problem, the policy stick was lacking. Thwack.
Tangentially, if you have an iPhone, I highly recommend connecting your health systems so that the records are retrieved and stored in your iCloud account, from a data sovereignty perspective.
https://en.wikipedia.org/wiki/Fast_Healthcare_Interoperabili...