1
I think the quality of refs can make the biggest impact.
You could see the rebels scrum last week breathe a sigh of relief and then play Murphy like a cheap fiddle once they got his mind made up.
He's overly technical and pedantic whilst being simultaneously horribly erratic and inaccurate. It's actually quite a spectacle to watch if you're not invested in the team playing.
The others aren't a whole lot better, neither over the Dutch, yes they're more consistent, but they tend to consistently pay fuck all attention to protocols.
If the refs were better we'd se fewer teams booting the ball downfield hoping for a mistake from the receiver or the ref and teams would likely start trying to break defense's down.
Unless they're the Brumbies, then they'd start at maul and move away from it only when the score is suitably comfortable