It's not but its a lot easier and safer to hold digital currency than wads of cash in your floorboards. Easier to acquire, receive from abroad and verify as well. It allows for a form of civil disobedience against unjust laws

Seems to me that an immutable transaction record going back to day 0 would be a very dangerous way to practice civil disobedience under many regimes.

All it takes is to turn one participant, and the threads can be followed to trace the money.

Is it though? If I hold wads of cash in my floorboards, you need to actually break in and take it.

If I hold something in a digital wallet, I can never be sure I've eliminated all the ways to take it remotely and anonymously.

You can print out a seed phrase and hold it under your floorboards as well, or better yet, memorize it. It takes up less space. You can split the phrase up and give it to a few trusted parties. You can do multi-sig. It's easier to transport, etc etc etc

Various weights of gold or silver are the better comparison versus wads of cash, but your point is taken since I guess the completely digital acquisition is the difference.