Goalline technology and VAR has been a great help to the game and has boosted its global image by eliminating blatant errors that impact major matches. By focusing on the four areas it currently does, it limits disruption and ensures the system is only used when absolutely necessary.
It makes sense to strictly limit the phases of play in which VAR can be used because there is usually far more for a referee to have to police in the penalty box or in the build-up to an attack on goal, than elsewhere on the pitch. Most fans will accept a missed foul in the centre circle if they know offside goals are a thing of the past.
Football was late to the technology in sport party but that does not mean it should blindly follow others down the same paths. You only have to see how many times review systems in other sports have had to be tweaked to see that the more technology a sport uses, the more problems it can cause.
There were enough issues with VAR during its testing phase to suggest that football must learn to walk confidently with technology before trying to run with it.