Even the coaches struggle to understand the fine details of what's now illegal. That's why every hip drop/disruptor penalty results in a panel of ex players arguing over it on tele. I'm pretty sure Sua'ali'i wanted to stop Walsh in his tracks as brutally as he could get away with, but I strongly doubt he aimed his shoulder at his chin thinking it would go unnoticed.
I'm not saying he deliberately did it... I'm saying he tried to put on a massive shot, lost control and it resulted in him airborne, his shoulder in Reece's face and a clear Cat 1.
He took the risk and it resulted in a send off and basically cost his team the win.
If it's known to everyone across the league that a player coming in like he did and the result ending up like it did for Reece then everyone should be expecting it to be a send off.
Coaches will start changing their tactics if there's a chance they lose a player for the game, because they know the game is basically lost at that point.
If a hip drop or cannon ball requires a medicab to come onto the field... then see ya later.
Players will become more cautious about their actions if they know the risk is basically an automatic loss for their team and weeks on the sidelines. They'll just stay away from it altogether... you also cant dive your way onto a medicab or if you dive for a Cat 1 you're done for the game and 11-days.
There shouldn't be any questions about last night's being a send off... having ambiguity in a decision like last night means people are open to complaining about "why is that a send off, it's origin, it ruined the game, etc." whereas the default response should be everyone knowing that it's going to be a send off.
If there are people questioning it then that's the NRL's problem to deal with it, because they arent consistent with their messaging and actions.
They need to get to a point where everyone watching knows that that is a send off... whether it happens in a nothing game or if it happens in the first minute of the grand final people watching should know it is a send off.
That removes the pressure from the ref having to decide "is the occasion too big for this decision"... people should be blaming Suaalii for his idiotic decision and not blaming the ref for making a correct call.