A yellow card and a sin bin is the exact same thing anyway. That said I support using the cards, there's been a small amount of research across League, Union and Soccer that says referees having a card are more comfortable using it than when they actually have to stop and tell the players they're being punished. I feel like that speaks for itself when Super League refs happily go to the pocket when someone is f**king about, while NRL refs almost look intimidated trying to tell players to obey the laws of the game. Yellows for sin bins and reds for send offs, no more of this "you're on report" bullshit, if someone coathangers another player late they should go, not stay on the field and find out their punishment a week later after they've already impacted the game.