Agreed. But it's not the carbs themselves, it's the calories in the carbs, and the fact that most of the snacks we eat are carbs. Avoid carbs and you avoid most snacks, which makes it easier to maintain a caloric deficit.

It was the same rational in the 1980s, but FAT was the villain then. Avoid fat and you avoid loads of calories (9kcal/g v.s 4kcal/g for carbs) which makes it easier to lose weight. But low-fat or low-carb is irrelevant if you're eating a surplus of energy, it's just going to make fat from that surplus irregardless of the macro proportions.