For the past few years (maybe longer) forward passes have not been referred to the video ref - for me I felt this was wrong where tries had been scored following the suggestion of a forward or an obvious forward pass had been made but missed by the match officials.
The argument against using the VR was that camera angles could be deceptive and time would be 'wasted' (although the clock is stopped) so keep the game flowing.
After the first try for Huddersfield against Wigan there was the possibility of an offside by the try scorer. However the VR's simply marked a virtual line across the pitch which clearly showed that the player was onside and the try was quickly awarded.
A similar virtual line could be drawn for suspected forward passes specifically in situations which result in a try.
There are cases where the momentum rule may apply, which I feel are few in number and arguably in most cases easily read by officials assisted by the VR.