Maybe you don't deliver products like that, but Apple delivers them all the time. Then you have to desperately raise noise on all possible forums, and hope to catch the eye of someone who actually works at a relevant team at Apple, before your customers get too tired of the issues caused by the bug and abandon you.
This is not an Apple-specific issue either, Microsoft works just the same. Large OS releases are a massive undertaking, and the release train don't stop for a
firewall bug - no matter how severe the bug is for the people it does affect.