Not all carbs are created equal.
Carbs get a bad press, but a small amount of unrefined carbs is fine. A small amount of potatoes, wholewheat pasta and bread. Fine.
Refined carbs are not good for us, but ok in small amounts. Most people who eat junk food, who eat processed food and eat too much, eat too much refined carbs, fats, sugar, everything.
Unrefined carbs help your digestive system, fill you up and are better for you.
I lost loads of weight, decades ago on Atkins. It made me very poorly, listless and I looked awful. I understand that some bodies adapt to a low carb diet, and it benefits them. I need carbs for energy, well being and satiety and good digestion. But I only eat controlled amounts of unrefined carbs.
Diets, like SW, which encourage lots of carbs and foods enhanced with artificial sweeteners might be good for some, but I can guarantee that if I followed a SW diet, I would gain weight.
Portion control, food in, energy out. Getting the best nutrients from the foods that satiate your appetite. That's the key.
A lot of people want the magic wand of low carb diets, low fat diets, SW, etc. They want to eat unlimited foods.
Newsflash: They don't work in the long term. You have to eat less food, eat healthily and get the weight off. Then the hard bit, you have to eat a bit more of the same, to keep it off. But you can never go back to your previous eating habits that made you overweight, because that means you're back to square one.