Steesafc
Striker
How big is this margin going to be for clear and obvious? What if someone is 1mm either side of this margin? If anything you've now created 2 lines, 1 ahead of the current offside line and 1 behind the line so potentially even more debatable decisions as current clear onside/offside would now fall near those 2 new lines.
Daylight between the players. The advantage used to go to attacking players