I get your point but you say VAR doesn't stop bad decisions?
You are surely not suggesting that Man City would have still had a penalty decision last night with VAR??
It will stop some bad decisions but then it will create some.
One jumps to mind when a Central Coast player (iirc the team) had the ball point blank blasted at him by a defender on the goal line and it went in after hitting his chest and just about brushing his arm (his arm didn't move). The Ref gave a goal but just about everything is reviewed so VAR got hold of it and told the Ref to have a look. He did and changed his mind disallowing the goal. It was not a clear and obvious error, in fact the original decision was a perfectly good decision.
Another example, a Ref gave a free kick for a foul outside the box as it all happened outside the box with maybe the forward's arm going over the corner of the box. Even though it all happened outside the box for some reason the VAR official called the Ref to have a look who then gave a penalty. The explanation given by the Officials for the decision didn't make it any clearer as to why either. This was the one where Mark Bosnich went on an epic rant.
So as said earlier, all VAR is really doing is adding another layer to the process (and time) of still getting bad decisions from Officials. Using the examples of the Aussie officials, if Darren Deadman was using it I would continue to expect the same level of poor decision making from him as if he was without VAR.