Not only that, but there is more going on than just auditing. If Apple spent the time necessary to constantly do deep security dives, and spent the money on top

Not only that, but there is more going on than just auditing. If Apple spent the time necessary to constantly do deep security dives, and spent the money on top talent to do it, it still wouldn't get done because it is constantly a moving target unless they froze all new development. Otherwise they have done a complete walk through of Mac OS 12.1, but 12.3 is released and they have n't even started on a full walk through of 12.2. These are time intensive tasks, meanwhile customers and shareholders are still wanting the latest, greatest, and shiniest. Then at the end of the day, customers are still installing 3rd party applications, so does apple have to walk all of their code too?