I don't blame the practicing radiologist, but I also don't buy this is purely a technical issue. The hospital is quite literally incentivized to have you repeat tests. I highly doubt they care to make data accessibility/portability a priority. Hopefully these new rules will force their hand.
You are right, to an extent. Health systems and EHR vendors both have historically had an economic disincentive to share data. Think “ecosystem lock-in”. My impression is that things are gradually changing for the better.
