Why is vermouth always sold by brand name? Dubonnet, Cinzano, Martini, Noilly Prat, does the brand matter that much?
If I go anywhere and ask for a vermouth and lemonade, no one knows what I am talking about, but if I went into a bar and asked for a whisky soda, or a gin and tonic, the server, might well then ask me what brand I wanted, but they would immediately know what drink I wanted.
Whether the RF drink, Dubonnet or any other of the brands I mention, all they are drinking is vermouth and whatever their choice of mixer is.