Knowing your calorie count helps you understand where you may be overestimating your exercise and underestimating your intake, which is a common problem when people try to lose weight. As you gain more experience, the data itself becomes less and less useful.

I'm not convinced that ever-more-granular access to data (such as precise micronutrients) makes people any healthier than those who don't pay attention to them.

All things in moderation. Including moderation.