Biggles
So what is the difference between aircraft of all sizes and speeds carrying out two 90 degree rate 1 turns or one 180 degree rate 1 turn - they will still be all over the place.
I suspect the arguments for the finite base and final turns do have merit for student or low time pilots and in busy circuit areas but for pilots more experienced and familiar with their aircraft the descending turn from base to final is more efficient - just ask the aggies.