Fiber is only "essential" in the context of eating food that isn't appropriate for our digestive system. Eating an appropriate diet primarily of meat requires

Fiber is only "essential" in the context of eating food that isn't appropriate for our digestive system. Eating an appropriate diet primarily of meat requires no fiber whatsoever. The idea that fiber is necessary for anything but mitigating some effects from an inappropriate diet comes from the American dietetics association's desire to push a plant-based diet despite all the evidence contrary to plant-based diets.