@erik_squires asks a really good question:
"What exactly do you think the difference is, in setting up 2 speakers between what we are recommending?? , because I can’t see it. :)"
The difference is admittedly subtle. Just to recap, your suggestion:
"You want to place the first sub as ideal as you can, then place the second so it fills in the nodes left behind."
And mine:
"deliberately placing both subs with asymmetry in mind."
Both suggestions end up with asymmetry; but there is a minor difference in the starting points: Yours starts with optimizing for one sub and then adding the second, and mine starts with planning where they BOTH will start (which is far apart, and asymmetrical).
My partner Jim Romeyn (who manufactures the DEBRA system and is probably better at set-up than I am) recommends your approach, complete with ye olde "subwoofer crawl".
Duke