Well some of us are old enough to recall a Chipmunk landing on top of another Chipmunk at Nottingham (Tollerton) in the 1960s. Guess what? The one on top had done a long straight in approach and was also non radio (and incidentally had not PPRed). Very fortunately all came away unscathed - miraculously the (solo) pilot of the lower a/c had his shoulder harness cut by the rotating prop of the other aircraft!.
One advantage of the SOJ (assuming it is being flown what I would term as "correctly" is that the descent is being conducted in turning flight. This means that the airspace below the aircraft is being continuously cleared for other aircraft. I cringe when I see guys descending on the dead side in a straight line parallel to the runway! The descending turn also means a better view of the landing runway where aircraft taking off, touching and going, going around and on initial climbout may be easily observed and a sensible decision made as to how to fit into the pattern without disrupting traffic already in the circuit. Whichever way you join the circuit you should be in level flight BEFORE entering the live side.