A lot of people add it into their organic mixes due to the microbial activity, which helps break everything down in the soil and soil upkeep is tended by your microbial life. When growing with organics your goal is to feed the soil web and not the plant. The little microbes in the soil break down food for the plant to absorb properly. When you read about "chelation" in synthetic nutrient lines it is basically them taking nutrients and breaking it down into its most available form and concentrating it into a bottles. Basically your microbes "chelate" the nutrients in your soil to a more bio available form for the plant to uptake.. strong microbial life helps keep the rhizosphere (root system main ball) cleaner, creates better uptake and breakdown of nutrients, creates beneficial microbes that fight bacteria, etc....etc....
@Eyes on Fire does this sound correct? Anything you might add bro?