> Trying to save up for the down payment on a house or a new car? Nope, that tax return we gave you expires in 3 months to force you to stimulate the economy. Bought a gun that was completely legal at the time, but the government has since decided you shouldn't have it? We have a record of you buying it, so we'll send the ATF to raid your house for it. Said something critical of the current president on social media? We've frozen all your money until we reeducate you.

As you mentioned, these scenarios would be theoretically possible currently with cash held in bank accounts—or, put differently, the vast majority of cash held by people. If government wanted to do these things, or alternatively, thought they could get away with them, why would we not already be seeing it?