You should not have knife at home, because you could kill somebody with one. <-> We should allow full privacy on crypto, because the government could kill cash.
My point is that it's pointless to be idealistic about how things should be, what matter is how they are. Why would a government which seeks to track its citizens every move keep cash around, when digital money suits their purposes better, and the vast majority of people pay using their phone or card anyway? When that happens, you have 0 way of transacting with anyone without the government watching over your shoulder.