You're right, but there's no question that being somewhat vague with the patch details and producing only a changed binary means attackers will be slowed down a

You're right, but there's no question that being somewhat vague with the patch details and producing only a changed binary means attackers will be slowed down a bit from producing a functional exploit. Even if you're only buying yourself maybe ~6-24 hours, that might mean N extra hours for millions of machines to patch.