Used to be so. Not anymore. I've been involved in scrums as both player and a referee since I was 5. I think there were (probably still are) over twenty different penalties that can come from a scrum.
One thing to remember is that many of these scrum rules now is to de-power the scrum. It's a safety issue for the many junior teams playing out there. What works for Moruya Under 16s is the same for State of Origin. Can look ugly, but such is life.
Where's Snow? He'll tell you what happens in a proper Rugby Union scrum where full contact and the scrimmage rules apply. I love seeing sides contest scrums - but I've been in too many where my pack was being dominated. Oh, the pain, the pain ..........