https://www.theguardian.com/football/2019/sep/22/var-to-fore-excellence-goals-liverpool-victory
your fav var conspiracist here
"
Drawing a best-guess straight line is not accuracy, consistency, or whatever it is we expect. There is only a pretence of academic rigour here. Understanding and acknowledging a margin for error, incorporating uncertainty is a part of being precise. This is simply bad science.
Fast forward 24 hours and Mount’s foot was, arguably, slightly more offside than Son’s armpit. But only arguably, and based on a line that there is no evidence we can actually trust. A middle-aged man playing with a light pen is not the Large Hadron Collider.
Plus, of course, what is offside actually for? Firstly to stop the game from losing its shape, dissolving into a cross between Aussie Rules and mass goal-hanging. And secondly, in its finer margins, to stop players cheating by pushing this enforced line and gaining an advantage.
In this case there was no advantage to Mount in having a toe, arguably, beyond the line of a player 20 yards away. It didn’t cause the game to lose its shape. It was offside because a man with a pen drew a pointlessly certain line.
Most people have by now “backed a horse” in this race and are intent on arguing it to the line either way. The idea of being pro or anti VAR has its ideological, even generational edge. Suggest this isn’t currently working and you risk becoming a Proper Football Man crying into his Charles Hughes coaching manual about the death of My Day When Things Were Good."