If that were true, why does everyone talk about it in fiat currency terms? Why would it matter what price BTC is, if the goal is to just use it? Who cares, then

If that were true, why does everyone talk about it in fiat currency terms? Why would it matter what price BTC is, if the goal is to just use it? Who cares, then? I don't buy that argument. It seems to be mostly fueled by greed.