I think we have to be very clear about whether it is blocking/impeding progress of opponent or simply being in the way, which is not necessarily an offence.
The definition of impeding progress of an opponent without contact (and I assume is the same for with contact save for the difference of contact or not)
"Impeding the progress of an opponent means moving into the opponent’s path to obstruct, block, slow down or force a change of direction when the ball is not within playing distance of either player.
All players have a right to their position on the field of play; being in the way of an opponent is not the same as moving into the way of an opponent."
So I think it very much depends on the exact circumstances of each case as to whether an offence occurs on not. I see no reason why standing in your own half, directly next to an opponent in their half is automatically an offence. We need a combination of factors listed above in the definition of ItPoaP before we can arrive at an offence..