But then when someone states that there are benefits to Low carb... (Did you note that in my post I said, "Regardless of some mysterious 'metabolic advantage', or not, its easy to see that LC diets to tend to promote weight loss over and above LCal/LF diets over time."), you get a bit nuts with the Fat=Sugar bit, and the ONLY important factor ever is protein.
That's just not true, and it makes you sound a bit off the rails.
For many people consuming more fat keeps them on the diet longer and helps them lose more weight, as I stated in , my post where you only chose to respond to the one small summative quote.
And for many people eating low fat and high carb makes them more hungry... defeating the diet.
There are benefits to fat. Eating fat is necessary: fat soluble vitamins.
I have also stated that calories are important several times... you skipped that too.
Calories being equal LC/MC wins because more (not ALL) people can stick to it instead of just quitting from hunger.
As far as adding fats... really what is the problem? If the person doesn't wish to eat large volumes of food for a specific reason, or cannot, it's vastly better than sugar. Eating a similar caloric amount of refined sugar can cause headaches, hypoglycemic cashes, and increased binge behavior in many people. Fat =/= sugar no matter how much you like to say it does, because the body does not process and react to it the same way.
As I said before... instead of taking these hard lined approaches and making over simplified statements that discount important factors in the process of dieting, actually posting information that helps people understand how EACH of the mechanisms, Protein/Fat/Carbohydrate, individually may affect their diet and appetite would be helpful.