More importantly, the fans have the right to know why a penalty was given.
That's the big one. If you remove the theatre of the game (which comes from knowing what is going on in every aspect), you risk disconnecting why fans get into RL, especially at the ground.
It also seemed (but maybe it was Ch9) that every "six again" turned into "zero tackle plus six again" - which is obviously 7 tackles.
It also seemed the refs were more inclined to give a "six again" penalty when in 2011 they would have let it go. The "six again" should've simply replaced what was a penalty given in 2011, not see it as an opportunity to give more penalties due to the lesser punishment scale.
Seems they need hand/arm signals for the referee that can inform the players, fans & commentators what the "six again" was for. Some of the penalties arguably aren't worth "six again" - some maybe should graded like NFL....But all of that is probably unworkable as RL is non-stop, whereas NFL has a natural break between each play.
I would like see more experimenting with the idea - it is worth perservering with.
The power play proved to be as absurd as most thought it would be. The only surprising aspect was seeing/hearing those standing in wonder at an 11-man team scoring against 13 - as if a try involving all 13 attacking team's players (directly or indirectly) is a common thing!