Having arbitrarily many segments is an improvement. In particular, we have some tooling that depends on a calculated image name, and we have to pre-pull and rename images locally if we store those in GitLab's registry.

I think for an Enterprise customer being able to push images that don't match the user/org pattern would be good too. While you couldn't allow just anyone to push e.g. 'ghcr.io/docker/docker:stable', I think this is a valid want for an internal/self-managed registry.