From the documentation I found for kSecAttrAccessibleAfterFirstUnlockThisDeviceOnly, it sounds like what you are doing here is explicitly opting out of support

From the documentation I found for kSecAttrAccessibleAfterFirstUnlockThisDeviceOnly, it sounds like what you are doing here is explicitly opting out of support for the usual secure mechanisms Apple users have to back up their device--such as an encrypted iTunes backup--which, to me, seems pretty egregiously wrong.