My understanding of the division line was to limit the amount of space that the offensive team had in which to play keep-away.
Before returning to the backcourt became a violation and the 10 second limit in the backcourt was established, it was nearly impossible for the defending team to get the ball away from the offensive team if they didn't wish to try for goal.
The game needed a proper balance between the offense and the defense so the amount of space in which the offensive team could operate was reduced. This restored the balance and gave the defending team a legitimate chance to steal the ball.
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