Earlier quoted context omitted.
Some of us find it incredibly hard, almost impossible, to just eat less. Also some would argue that keeping a food journal and measuring every calorie you eat is far more complicated than special diets like "don't eat carbs" which are successful for some people without measuring or recording anything.
Not sure why you are getting downvoted. Counting calories is fairly simple if you are eating fast food or out of packages. I found it to be a huge pain in the ass when eating whole foods.
Doesn't mean I was eating it 3 meals a day, mind you; still mostly brown rice, broc, and chicken breasts. But I could plan around a lunch at Wendy's, while the local steak house was a crapshoot.