There are a few points here.
To say that you cannot anticipate the impact of a rule change until it is implemented in AFL games is frankly ludicrous. If that is the case then just sack the expert panel because they serve no purpose. Of course the impacts of rule changes can be anticipated, nowhere near perfectly, but the impact can be anticipated.
The sheer number of rule changes year after year after year is really absurd. The way the AFL change multiple rules every year is a joke, it makes Australian Rules look like some recently invented game still trying to iron out the kinks, not the oldest codified football in the world. I'll also add that the morons at the AFL seem intent on trying to fix something which is not broken, Australian Rules Football remains the most exciting, fast moving code of football anywhere.
As for the decision in the West Coast/Freo game, well, what can I say? Looked ludicrous, apparently not in the so-called "spirit" of the game, but, entirely consistent with the rule they have created. Although the laws of Australian Football 2021 are not out yet there was a graphic on the AFL site back in November, as follows:
Now, let's just ignore the clear contradiction there - are you allowed minimal lateral movement or can you not move off the mark in any direction? Could they learn to write a rule properly? Yeah, probably not, their form is bad on that one.
But, on to the specific incident - the player moved off the mark - 50m. The AFL will probably claim the ruling was incorrect, but it fits with what they published.
And some wonder why we're able to anticipate such garbage outcomes. We all must be geniuses because this is precisely what was anticipated, precisely what we expected, precisely what the rule states according to the AFL themselves and precisely the sort of ridiculous outcome we were worried about.
DS