Imo VAR should only exist in a technical capacity to prepare footage to transfer onto a ref’s portable Fold 5 or something. Samsung could sponsor it even!
The decisions should all be made by the ref on pitch and this would massively improve the speed of play during VAR. There’s no reason they should have to walk off pitch.
Because the VAR scfreen is bigger and because it stops the players coming over to watch, as they’re not allowed to leave the field to watch it, whereas they can all crowd the referee if they whip their phone out on the field.