VAR working fairly well in the world cup - some decisions are always going to be subjective so there's always going to be some disagreement.
I like that the VAR decisions are rapid - not interfering with the game - and though some decisions seem questionable to me, I think VAR has by-in-large got it right.
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As an aside - there's a way, given today's technology, to remove human bias variability from VAR. Simply convene a panel of those most well-respected referees, have them watch penalty decision videos and adjudge whether it's a penalty or not or to close to call. Save this data and use it to train an AI. Once sufficiently trained, make the AI available online and then use it in lieu of human VAR.
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This computer problem is likely harder than I've described as the input is video footage rather than a single frame of data which will likely pose new AI problems - nonetheless, it's my opinion that AI can reach/exceed the level of today's human VAR panels.