https://www.newscientist.com/article/2171366-stop-the-reckless-video-assisted-refereeing-experiment-now/

Since the league debut of video-assisted refereeing, or VAR, in Australia in April 2017, a series of leagues have allowed their matches, the matches whose gravity they consider sacrosanct in other circumstances, to be fodder for a reckless experiment that deals specifically with the incidents that most affect the outcome.

The results have been disastrous. Implementation has been inconsistent and disruptive. Decisions take too long to reach, a problem often compounded by a lack of communication to supporters in the stadium.