Your point isn't quite valid. There are fantasy things with no real world counterparts like space magic, but we have guns irl. We don't fire Star Trek guns most of the time. Stuff like the Vex Mythoclast were left out by the OP as they are fantasy. The guns he's mentioned are modelled on real world guns, and have geometric impossibilities built into them that [i]break[/i] the fantasy, rather than adding to it.