“You won’t consider feeding Weet-Bix to a lion, why would it be suitable for a cat?” – Helena Swart (founder of RawLove).
Cats are no different to other meat-eating predators – they are obligate carnivores, meaning they need to eat meat to live. Because eating a meat-only diet provides some vitamins and fatty acids in their pre-formed state, cats and many other obligate carnivores have lost the ability to make these amino acids and vitamins in their own bodies the way herbivores or omnivores do. They don’t need to since the animals they are eating have already done it for them. For example, cats require vitamin A in its pre-formed state, but can’t make it from beta-carotene the way humans or dogs or rabbits can.
Kibble is manufactured mostly from grains. Chemical nutrients must then be added to try and ensure cats are provided with everything their bodies need. Simply feeding a meat-only diet will do this without having to try and copy nature, and maybe failing.
For further reading we also highly recommend Dr Lisa Pierson’s website https://catinfo.org/ which contains a wealth of information about the appropriate diet and care for cats.