Satoshi solved only half of the problem of digital cash system - the biggest one. He created an immutable public ledger of assets against which large asset holders may issues cash - for example companies can hold bitcoin on treasury to issue equity. Countries may issue currencies. It was important to have this ledger public so that anyone may be able to verify how much dilution baked into equity or currencies. He left it for the asset holders to decide the implementation of their cash systems based on location in space and situation in time for cash can never be scarce or fixed in nature - only assets can. In the process he created an apex asset for human race and digital beings to follow.