I disagree. Stirzaker was also guilty of obstruction. In almost every instance of obstruction, where the obstructor is tackled, no one ever complains of the tackle being taking the man without the ball.
In terms of seriousness, if we are placing a shove higher on the scale than offside then I think we're in trouble. It's not like Genia Horwilled him.
Ever since I've been involved in rugby, the laws are there for the referee to enforce not the players.
With respect, your analogy isn't really comparing apples with apples. When an obstructor is tackled he is generally a decoy runner who is in a position to catch the ball and the tackler has misread the situation. Genia is deliberately pushing a player who is not in possession of the ball, there is no obstruction as the ball is in the middle of the scrum - neither player has a chance of picking the ball up. Nor does Stirzacker have to get out of Genia's way - he can't move in front of him to obstruct, but he is under not obligation move move. In the situations that I observed the push was almost immediately after the feed, I'm not even sure that Stirzacker was offside in most of the cases. Are we saying now that the attacking half back is to be penalised for offside if he is slightly slow getting back around his scrum?
In addition, Genia is not allowed to put his hand on the scrum while he is floowing the ball around.