Let's not forget a huge problem in our modern world, and that is multiple, sovereign nation states willing to do anything and everything to get leverage against

Let's not forget a huge problem in our modern world, and that is multiple, sovereign nation states willing to do anything and everything to get leverage against one another, including trying to infiltrate and hack every single piece of hardware and software produced. Gone are the days when human fail safes could catch each other. Now, any computer can be hacked so no amount of them will prevent attacks unlike a line of humans who have to vet the information.