It cant be as I've seen plenty of offsides given this season by VAR for hands etc being off.
Patrick Bamford was given an offside for pointing where he wanted the ball to be played!!
As people have said, the rule is any goalscoring part of the body. The issue is, as you also correctly state, is that in most cases I am seeing is that they are using the arm, it may be that they are trying for the shoulder but it is so fine lines that a lot of the time the body position does not allow for this to be judged effectively or fairly.
For me, there is no question that there has to be an element of doubt. For example, a certain distance between the lines to conclusively say that the attacking player was gaining a clear advantage.
I watch a lot of Rugby and the TMO process is used correctly, it could be more obvious as you get to hear the decision making process from all officials. It can be annoying if a try is scored and then they go back 5/6 phases to find that a pass had gone slightly forward, etc. but it generally is a good process and works. As I said though, you hear/see the process clearly and an audience whether in the ground or at home. We now get to the issue of respect and communication of the officials and I think we can all agree the respect and trust in football is just not there.
