Fermentation is still resulting in live organisms. Which essentially is what makes up a lot of food we eat. It doesn’t come out of a machine as only one atomic building block. And it is absolutely necessary in our nutrition to have this biodiversity even on a micro level to keep our body functioning.
Though it doesn’t mean you go lick the black mold in your shower. Just get some basic education of nutrition to the point you’re not so absolutely this negligently dumb about food as the OP.