You can't really take it to a bank. You can buy a cheap banger (car), but forget wandering into a dealership and dropping 25k in cash. (Apart from anything else, they'd be worried the cash was stolen or counterfeit.)
Travelling with it is risky. Flying especially. And in the US there's the danger of confiscation by the police. Everywhere else there's confiscation by the public as well.
You can't buy a house. Certainly no shares or most other assets. Hotels, maybe, depending ion the hotel. Nothing too fancy.
Groceries sure. Day to day expenses, sure. Just no Amazon.
Like I say, cash just doesn't scale well (despite what you see in the movies.)