> Cash is not very useful if the power is out either

Sorry, what? I literally bought my lunch with cash the other day when the restaurant I went to had lost its power. Where do you pull these assertions from?

Ask everyone living in South Florida post-hurricane. Cash is king.

You do realize that cash was in use before electricity as a utility was a thing, right? And that food is actually more critical for survival than electricity, right? And that you can exchange cash for food without electricity, right? And that blackouts is a thing that actually happens, right?