Nobody is sustaining their iron copper and magnesium through carrots. Not eating carrots won't kill anyone. None of your points matter unless you're a vegan that only eats carrots.
I only made one point: it is silly to pretend that macro nutrients are somehow more important than the micronutrients, when, in fact, you can do without one of the macronutrients entirely and without any ill effect whatsoever but there are many micronutrients that you will die or suffer life-threatening disease without an adequate supply of.
You may not like that fact, but it is a fact and your straw man about vegans eating carrots that you hallucinated into my post doesn’t change that.
Your scenario is the one with no bearing in reality. In the western world, we do not suffer from a lack of calories from macro-nutrient deficiency. There are, however, people who suffer from micro-nutrient deficiency along with a mountain of research that micro-nutrient supplementation is inferior to consuming adequate micro-nutrients in diet. Research about declining micro-nutrient levels in staple crops is both important and more applicable to daily life than whatever non-sense you are imagining with vegans and carrots.
