I can't tell if anything you have said contradicts my observation that some headphones obscure soundstage cues. I don't understand the point of what you are trying to get across, unless you want all head-fiers to say "the impression of soundstage" instead of "soundstage," because headphone soundstages are different from speaker soundstages and therefore not real soundstages. Which is really rather pedantic. Furthermore, "Soundstage is the placement of sound precisely in space. That is only possible with speakers" is entirely your opinion and contradicts the experiences of many if not most headphones users, so I take issue with your stating it as fact. People are going to keep using the word "soundstage" in headphones whether or not you believe it's the correct usage because there are large, generally agreed-upon differences in spatial presentation of different headphones.