Off side rulings can be done,you can use the line like the VAR in just about every soccer competition around the world,you just have to make the rule very clear as to what part of the body can and can not be in front of the ball.As for forward passes,you only have to look at how hard it is today to judge/rule on them,to see that you’d open up a can of worms if you involved the video ref.The problem with the bunker is that they seem to be getting involved with absolutely every minor indiscretion,rather than just abolishing the howler