But the lines have previously overlapped and offsides given because the line representing the attacker is closer to the goal.
EDIT: In fact, the Premier League's own website explaining how the offside decision works says:
"The thickness of the line has no impact on the accuracy of the...
I fail to see how this helps.
If they are looking at the difference between, say, the last feet of two players. One foot is 1 pixel further forward. They put a 1cm thick line against each foot they then look at the pixels 1cm from the feet. If you use 5cm thick lines, one foot is still one...