I'm sure that some of you folks have played a hand of black jack or two while in Vegas. Ever wonder why, when you double down, you must make one good before you look at the other? Could it be you might compare the hands prior to making a decision or it might influence your decision on the current hand!
Actually, I was involved in this procedure early on when on the PNWBA board. We found that the time differential was minimal but this was before they started the comment for each score procedure so I can not comment on the time requirement now.
I cook, judge and TC at KCBS events and still believe that the PNWBA procedure, minus the comment cards (due to time restraints), benefit the cooks, period. The food is hot, even after 15 minutes in the CLOSED box, not sitting on your plate, open to the air, for the 10 minutes between box 1 and box 6, not to mention the hold time waiting for enough to fill the tray and get to the table ala KCBS. Also, there is no subconcious comparing of entrie side-by-side on your plate or holding out that "9" just in case.
At a larger contest, the last table judging at a KCBS contest, can still be judging the last entry when the new ones start to arrive. If you don't believe this, go judge and/or TC one. You might be surprised at the time and the pressure to rush placed on the judges to finish as the next is coming in.
I cook IBCA as well, and appreciate Deenas desire not to mix in "the man off the street" with trained judges. If this were to occur, then all the the tables should have been populated with untrained and let the CBJ's tc and other duties. Even mixing them whould have been unfair.