This is just my guess. I think that to a certain extent they consider the room size a certain design is optimal for. I don't think they would expect a customer to use standmounters in a large room, for example. Same as you cannot use a Tannoy Westminster in a tiny room. They don't go as far as providing room measurement specifics since it may cause audio nervosa and potentially turn away some customers because their room does not measure 15 x 15.
