I do agree that it is both. And it depends on the user himself, how he gonna manage his bitcoin.
Some here are earning btc for their everyday expenses so they are likely the ones who are converting their crypto to fiat.
So even if they can't see merchants that are directly accepting btc, they can always convert it to their local fiat.
But for some, who can afford not to touch their btc, they have the option to hold it for long term and so it can be their investments.