> The convenience of digital simply made cash useless (mostly).
Useless? Wait until your digital transactions fail or your bank or your state decides to block your access to your payment system. And believe me, it's not a "if", this is a real threat that will be waged against people. When it's technically possible, it always ends up becoming a reality. And by that time, "going back to cash" may not be an option in certain places, because of 'convenience'.