Foods, ingredients, preparation, sleep, cycle data, activities, allergens, symptoms, and medical context can interact in combinations that simple diet rules often miss.
The goal is not to force everyone into one diet framework. It is to create a better record of foods, conditions, and events so practitioners can reason about what may be driving reactions, progress, weight change, or stalled progress.
If you hate being told what diet you are going to follow because it never fits how your body actually works, you are in the right place to find a practitioner who uses a fuller model.