From many articles I have read, it is not the case that the VAR system is 100% accurate. The camera only captures an approximation of the relation between the receiving player and the passing player at the time of release of the ball. In reality, the receiving player and defenders are all normally moving at the time of the release of the ball so scope for a margin of error emerges. This can be anything from 10cm up to 38cm depending on the speed, direction and location of the various players involved. This perspective, moreover, passes the commonsense test: these are elite players who train relentlessly to avoid being offside in attacking moves, ie doing the opposite of "seeking an advantage."
Yes, that's exactly the point. It is not 100% accurate, but it's a level of accuracy that we've never seen before...picking up heel offsides on the far touchline for a player moving away from goal is something i never thought i'd see.
So how do we define the "commonsense" test into a written rule that everybody can follow and understand instantly, so it doesn't take 3 minutes of replays?
It's the same as trying to define what "clear and obvious" means, or even "interfering with play". I even heard Andy Townsend commentating on a handball the other week, saying that it wasn't "intentional". This guy doesn't even know the rules as they currently stand in the sports he's a professional commentator in?
The problems arise when you realise that everything ends up with a human brain making a decision, and that can be a polar opposite from the man sitting next to you, depending on their own perspective and subconscious bias. You only have to sit with an opposition fan to realise that.
We can't even agree on what should be reviewed by VAR on a consistent basis...sometimes they review, sometimes they completely ignore it, in consecutive games on the same day. That's the human input.
They need to articulate the rules correctly to suit the current climate, but it's natural for rules to evolve in parallel with the technology. It's very difficult to do.
The way it's been implemented in the UK is different to elsewhere, they put decisions solely in the hands of a brainless system...but then a human still decides whether the system gets used, so we retain the bias?
Arguably, that is the least-biased way to go, but the rules need to be nailed down to make it workable or you end up killing the spectacle.