Comment by antonvs

Binary blobs can be easily reproducible, depending on how they’re built. By comparison, the “easily” part doesn’t apply to any non-trivial Docker image.

The issue is that you have to lock down all your dependencies, including local data, repos, and registries. Most people, and even most companies, don’t have the resources to achieve that, so they simply don’t do it.

Further, Docker doesn’t provide any significant mechanisms to help ensure reproducibility in the face of these issues, so you can’t say that Docker supports reproducibility.