I want more lockdown of the original documents (put them in a cave somewhere), but more openness of digital scans.
Please just make a huge torrent and let everyone take a look.
Indeed, the archive has cavernous branches, in the literal sense you desire.
https://www.archives.gov/publications/prologue/2016/spring/h...
There are a significant number of digital scans available online. The problem is that they're only a tip of the iceberg of the available material, and digitizing records costs time and money (that apparently they don't have much of right now).