Whilst I understand what you mean about giving the ref the sole decision on VAR, how would that make any real difference to how it is now??
At least letting the participants of the game take control with the 2 challenge system (and potentially as well as the ref as they regain control), we would see many of the things we currently complain about (diving, surrounding the ref etc, etc) dissipate.
Maybe not all together, but certainly way below the current average.
I really like the idea of 'pick your incidents carefully' to teams. Yellow cards dished out after they run out of challenges if players ask for a review? Imagine a player trying to 'take a tumble' who's already on a yellow? That idea's ace and would stop the bullshit straight off!
What's not to love...??