“Count your calories” means “Go hungry every meal”
You ignore the factor calory density here. So, yes you can put your effort into restricting how much you eat, if you want to keep constant what you eat. But you could reinvest the effort in restricting the quantity of your food into restricting its quality. Furthermore, you could confuse hunger for appetite and - no judgement - this could come from a misalignment of your dopamine system and hence mental health.
Furthermore, you could confuse hunger for appetite
A distinction without a difference: if you don’t eat some more, you will suffer. In the long run, people eat until they are satisfied. Call it hunger, call it appetite, call it cravings, call it whatever you want. Stop eating too early -> suffer.
That’s exactly why I mentioned effort. You can suffer from your effort or from the lack of it and most of the times, suffering from effort is awarded with pleasure, while suffering from the lack of effort spirales into more suffering.
Sure. Let’s do an experiment. Try losing 5Kg/10lbs and maintain that weight loss for two years. Show us how rewarding it is to feel hungry after every meal.