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The technique of walking down the sideline is essentially the same as a wing official going to the spot where the ball hit the ground and walking back toward the spot of the kick. But that is slower and the wing might get lost or beaten up out there.
The R stays back at the spot of the kick and establishes that line, the path the ball took after bing kicked. So now he has one line which extends from the spot of the kick to some point out-of-bounds. The wing official then comes along his line, the sideline. Where the two line cross is a point, the out-of-bounds spot. This gets the same result and since the ball still has yet to commit a foul all of the officials who were in the area of the field where the fouls could be committed would be watching the players and not where the ball landed.
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