Ask Gary what he thinks about smb
Not preboiling the water to deoxygenate it, renders campden basically useless(unless you use a very high quantity). It takes 5ppm meta, to dissolve 1ppm oxygen, and campden has fillers.
I'm still trying to reconcile this with Martin's calculations that the dose of sulfite is more than plenty to neutralize what is in the strike water. https://www.homebrewersassociation.org/forum/index.php?topic=24675.msg348119#msg348119
If what he says is correct, then preboiling may not be necessary BUT you'd need a larger (possibly detrimental) amount of sulfite to ensure enough is left in the mash. Have you tried higher doses?
If you reread the post you will see that he's CONFIRMING the dose rate in the paper as beneficial. What he's trying to get across is that he realizes that to onlookers the dose seems large and that it is true that only a portion neutralizes the oxygen in strike water. He then states that the remainder is protective, hence the extra.
Bryan and others who contributed to the paper measured, empirically (using DO meters), DO levels at various stages in the process. In addition, many still use sulfite test strips to determine the SMB consumption (not super precise but a good indicator of system performance) at various stages.
The reason you want to preboil is margin. Let's say your untreated water has 12 ppm DO. Now add 3 ppm from from dough in. Now add 2 ppm from atmospheric diffusion over the course of the mash. That's 17 ppm of DO that has contact your wort before you even get to the boil.
17*5 = 85 ppm SMB required. You've nearly used up your dose. If you consider that desired is < 1 ppm DO over the whole hot side of the process, we neglected DO introduced from pumping/transfer, boil and chilling you quickly realize starting out < 0.5 ppm DO by preboiling is advantageous and necessary.
Nobody is trying to put one past you or pull the wool over your eyes. This is all in the paper. It's simply a margin game. It's about Giving yourself the best chance at keeping DO low the whole process, not about making extra work for brewday.