I super agree with this, and the following are just general thoughts and not directed as a rebuttal to you.
I think that the whole "you need to lose weight slowly" dogma really really backfires for guys that are super heavy. It's just unrealistic like you say to tell someone to lose a pound or two a week for 2 years.
The thing is that for guys that heavy, the battle is almost entirely mental. For a guy with 15% body fat trying to get shredded-ish, it can become a slow grind where there's a lot of value in really dialing in every little piece of the puzzle.
For the average 350+ lb guy, they got there from yearssss of very disordered eating habits. The battle becomes 100% mental, because the actual "programming" is cake, at least initially. I had a 450lb client who I started off simply telling him to eat 3000 calories a day, hit a minimum protein number, and try to be a little more active (walking when he could).
No worries about weight training (yet), a strict diet (he was still eating Taco Bell, etc), grueling cardio sessions, drugs/pills etc (other than dialing in some basic supplementation).
And the first 80lbs or so just sailed off.
Sounds like heaven someone like me who has to dial everything in (or very close) to get that last 10lbs off, right?
Without consulting me, he started dropping his calories and doing a bunch of cardio. Guess what happened after 2 weeks? He got burned out, fell off the wagon, disappeared for a month and then came back and told me he'd gained back 30lbs and wanted to know more about the PSMF diet I had mentioned in passing once. Sigh.
So while there's a ton of value in pushing aggressively with someone like that, they have it even worse when it comes to burnout/rebound/etc.
I worry when I see someone talk about "seeing how much weight I can lose in 30 days" because while I have no doubt I could dial someone like that in to lose an absurd amount of weight, one of the worst things is to have a finish line in mind that's still 150lbs from where they need to be
.
The chances of hitting the 30 day mark, posting his "amazing results" and then disappearing for 6 months and coming back with another thread about how he fell off the wagon the next week and is now ready to try again is extremely high.