This specific example is why you wouldn't want to exchange your BTC into real dollars. The user doesn't want to withdraw fiat dollars, they just want to exchang

This specific example is why you wouldn't want to exchange your BTC into real dollars. The user doesn't want to withdraw fiat dollars, they just want to exchange Bitcoins into a dollar proxy, then exchange back. Sometimes the cost of a less-liquid exchange is higher than the cost of using stablecoins instead of dollars.