Poop is “waste” in the sense that the animal’s gut has extracted everything it can from the food. That doesn’t mean it’s extracted every usable nutrient – it just means that the animal’s body has done all it can. There’s still stuff that can be used, if only it breaks down more.
So you take the poop and work it into the soil. Bacteria in the soil continue to work on whatever is left in the poop – bits of plant material, carbohydrate, etc. The bacteria excrete their _own_ waste, which is even more broken down into its constituent parts. That’s what plants need.
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