Well the large fluctuations make it harder to use bitcoin as a currency , because when you buy something a week later you could have paid the double amount in dollar.
Bitcoin is still considered as a currency because it is a cryptocurrency or a digital currency which means it has a feature that is the same as a regular currencies like for example bitcoin can be used to buy stuffs online , yet i agree that large fluctiations make him a little harder to work as a currency because we can be able to pay double for the price tag if ever the value fluctuates but we can also pay lesser if ever the price of btc had decrease. Therfor it is still dependent.