As trials of the VAR system have continued and the technology has been refined, the amount of interference and delays have been significantly reduced. At the World Cup in 2018, the average VAR review took just 80 seconds.
While there is work to do to make the system more transparent, it is working and players, coaches and fans are beginning to understand the system better the more they see it in action.
The technology can only be made available at the highest level due to the costs involved. Trying to "level the playing field" by applying the same technology to every league would be too expensive to be unsustainable.
While some players and coaches are disappointed that VAR is not being used throughout Europe's top leagues, it is the clubs that have the final say.