However I think the basic idealogy in here has been that every workout day is basically a "refeed" and every burn day is a low carb day. .
Yea, I am not sure what people thought, or what gave the impression of a 2 day refeed. UD2 is just one of the many methods. I really use the "skipload" style of refeed.
Like I said prior the +-20% is assuming one is trying to recomp, lean bulk, or come down in fat VERY slowly etc. When strictly going for fat loss, at a decent pace, it is not ideal to be 20/20 IMO. For me, right now, solely focused on retaining muscle, and fat loss, it is not realistic to think I can eat at a surplus of 20% 4 days a week, and at a deficit only 3 days and lose fat at a good rate. It is just not mathematically possible, and at the end of the day IF is not magic.
My refeed consists of a fast of about 12-14hrs from Friday to Saturday morning, then a full day refeed, where I may take down 8000 calories easy. Sunday I fast ALL DAY, until dinner(5:30), and it is a low day for me.
However I am for the most part in a deficit every day, with fairly low daily carbs so like TG I NEED a refeed. If you are eating 400g of carbs 3-400 days a week, in a 20% surplus, a refeed would likely be foolish.
Martin himself uses a different approach for fat-loss. He will diet someone down, before implementing what you are talking about.
Again like I said pages back, the diet, macros, calories, etc needs to be adapted for ones goals, and other personal factors(metabolism, etc). When it is time to add mass I will probably start back off at the 20/20, or maybe even +10%/-10% and take it from there.
I have done it all. I have treated LG like a TCD, I have done a carb cycle like Shelby Starnes does, I have done a more traditional macro 40/40/20(and variations of this) basically all adapted to LG 16/8. I am constantly adapting, and experimenting with things. I will run one approach for a couple months, then make some tweaks, etc. Figuring out what works best for me.