Thanks for the feedback @lukas.christel_6718
In the year and a half since my last rant, it doesn't look like the state of OCI Registries has changed much. I haven't been seeing any real adoption beyond some quirky or niche uses cases like Flux, due to all the reasons I mentioned earlier. It's a terrible repository format.
That said, S3 (or the API I should say) seems to have become a kind of standard, and we're seeing a lot of users switch to S3 alternatives that use the S3 API: https://blog.inedo.com/proget/s3-alternatives For example, we've switched to Wasabi and have saved a ton in egress fees.
You should probably have some kind of S3-esque thing in your organization already -- and if not, you should set one up. ProGet Asset Directories are convenient, but they aren't designed to solve the same problems as cloud-like storage.
Cheers,
Alex