Not every offside gave advantages to attacker, in far right or left side the distance of attacker to goals are longer than center back that stand inside penalty box even if they stand in parrallel line
I think the better rule is penalty area should be bigger and in half circle shape (the length to the penalty line is same all the way from center of goal post. No offside rules outside penalty area, because no advantage if the ball played outside penalty area. And offside is count by length of players standing vs center of goal inside penalty area
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