This would indicate more the limits that technology has reached so far (except in rare cases where it might be greater), it is not determinative of the overall technology or the specific technology anyone has. In other words if we ended up choosing no guns or canons then you couldn't reasonably go out and create a race or culture that uses them. You could create a race that uses bows, or throwing spears or whatever, or still be so backwards they are still busy throwing rocks at each other. If however a "gunne" was central to a story or module you are developing you could have an exception with the understanding that the exception is limited and won't actually alter the technological limits of the world.