OK, so you are joining at a field using the "American" join, there are 8 in the circuit with the downwind full and most remaining in the circuit doing T & Gs, where do you and the other joining a/c go until there is a suitable break - orbit away from the airfield and you could be in conflict with other aircraft doing the same thing - plus you cannot see WIHIH whilst you are turned away from the field.
At least with the OHJ you are orbiting above the field, all in the same direction, with other joining a/c in sight and you can see the circuit to judge where there may be a suitable gap to join.
It may not be perfect, but I still prefer it myself to the other methods when it is busy and you do not have
positive control from the ground.
