Your points are valid but you are forgetting to mention the counter argument which revolves around privacy. How do you buy things and ensure your privacy is intact well for the most part people use cash. But it is a known fact that superpowers are set on removing cash from the equation. Without cash they have more control. Control is key when you operate a global economy of smoke a mirrors and print money endlessly without having a true underlying value backing it. Cryptocurrencies that allow users to remain completely private are vital to freedom. This point cannot be ignored!