You need permission to turn your BTC into USD, in order to pay for your rent and food. This could take weeks, too. The reason the regular financial system has all these high-friction components is because of AML/KYC/fraud.
If you think the interface between BTC and the real world won't eventually have to be compliant will all those onerous regulations, background checks, and business processes, you are vastly underestimating the persistence of our regulators.
It will always be possible to exchange you can't stop everyone from trading bitcoin even if it became illegal, people trade illegal things everyday but that's irrelevant bitcoin is legal in many countries so I am not worried
If you think the interface between BTC and the real world won't eventually have to be compliant will all those onerous regulations, background checks, and business processes, you are vastly underestimating the persistence of our regulators.