If bitcoin's purpose is to serve as an alternative currency for fiat, then why do bitcoin users still use the term "selling bitcoins to fiat" rather than "trading bitcoins to fiat"? This is the common thing that I see bitcoin users commit every now and then. They tend to value bitcoin like an investment vehicle rather than use it as a payment option replacing fiat.
If bitcoin is to serve as a currency, the correct term would be "convert bitcoins to fiat", not trade to fiat. It would be a currency conversion.