> - sauces you make yourself?… but weighting and logging everything will take 3x the time to do the sauce itself

Yup, it will. Nobody said tracking nutrients was quick.

> - different cooking time in one receive : oignons going first, tomato sauce in the middle and parsley at the end (but still cook a bit with residual heat)

Cooking time doesn't matter for macronutrients.

> - Leftovers nutrients decrease with time

They don't for macronutrients.

> - different species/cultivation methods like the rustic small and dense cucumber from your neighbor and the spongy one from the supermarket in January

The differences don't really matter for calorie purposes. High-caloric things don't vary in density meaningfully.

You seem to be confusing tracking macronutrients (carbs, fats, protein) with micronutrients (vitamin C etc.). People track macros, generally to lose weight. I've never heard of anyone tracking micros. I don't think it's even possible.