I am a doctor and I run a graduate medical education program. The constraining resource is generally funding, not limits imposed by ACGME. For example, my program is ACGME-approved for two trainees per year, but we have funding for one.
In this conversation, it’s important to distinguish science itself (which, along with facts, are already under attack in our politics) from failings of the research industry.
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.
Couple of points: The 21st Century Cures Act has recently expanded rules for information portability, which will make it much easier to get access to your data in the future. The challenge here has nothing to do with radiologists hoarding your data. The lack of interoperability typically stems from limitations of electronic health information systems. Most radiologists would love to be able to look at your scans from multiple previous hospitals where you were imaged previously, but technical barriers currently make that difficult.