I'm happy enough for refs to ignore offenses that aren't material, joining the maul in front of the ball as an example, probably doesn't matter most of the time.
From a equity perspective, I think they should be red hot on any obstruction, both preventing the opposition from sacking a maul as it forms, and also if the attacking team can't get the binds right and create a truck and trailer situation.
The Australians failed at the second on Saturday, with the ball at the back, and separation from the NFL blockers at the front, and that sort of offense should be penalized.