I agree I've never worked anywhere with really heavy duty CI, as in I've never worked somewhere that automated rollbacks were either trusted in all cases or bus

I agree I've never worked anywhere with really heavy duty CI, as in I've never worked somewhere that automated rollbacks were either trusted in all cases or business acceptable after something was production live. (Which is to say I haven't worked at places that had really significant scale.) And CI is only as good as your test coverage, which is to say if something esoteric is overlooked in your test suite...