Is there anyone alive who completely understands a latest generation iPhone down to the bit level? It would be impossible for someone outside of Apple to have t

Is there anyone alive who completely understands a latest generation iPhone down to the bit level? It would be impossible for someone outside of Apple to have the access necessary. But even if everything was completely open source would it be within the realm of human ability to understand something so vast and complex in the way that it was possible to understand a Commodore 64?