VAR is necessary for football (soccer) these days. It will prevent that player’s simulations, overreactions and any other named-action get along the game without noticing. One important fact is that at the end the main referee is the one that have the final decision of reviewing an action and/or the consequence of the action reviewed. The VAR (video assistant referee) is only a mechanisms to help the referees on the games!
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It did seem to work in the World Cup.