If they started to implement it to assure consistent decisions across all games, instead of prioritising the individual refs subjective view, they would effectively be training refs to be more consistent. Just use VAR consistently to intervene, with real authority, and the refs would naturally learn just from knowing which decisions gets overturned and attune themselves over time.
The system in place right now is serving no purpose other than to protect referees, and it currently enables refs to keep making mistakes. They are just celebrating independence from VAR before it has implemented.