Why would a government trace an Average Joe's crypto activity. i mean there are a lot of more important stuff to do for them
there are tons of average joes who skimp on their taxes, don't pay child support, buy drugs, buy guns and on and on. governments chase millions of average joes every single day. prisons are filled with average joes.
The average joe won't likely have the careful attention to detail to make their anonymity significantly difficult for the government to track them. But default anonymity protections could possibly protect the average joe from casual privacy invasions. And the meticulous joe could probably make it not worth the government's effort to track them given the necessary anonymity protocols in the crypto-currency system. The high valued target is nearly always going to be vulnerable to the NSA, unless that target's resources and expertise matches sufficiently the countermeasures the NSA can employ.