Mr. Argumentor
I fab shitboxes and shitbox accessories.
A cat's digestive system is the same as any other non-ruminant mammal - the same parts are there that you'll find in a dog, bear, squirrel, or human. There's nothing specific about their digestive system that requires them to be fed meat and only meat - a cat will metabolize any carbohydrate you feed it, whether it's animal fat, oil, starch, gluten, alcohol or refined sugar. Cats are carnivores because they evolved to prey on other things as a means of obtaining their food, not because they evolved to only digest meat.
So the bit of potato or whatever that's in my cat food? It's fine. As long as the cat gets the nutrition that it needs, and it's not being fed so many simple carbs that it throws the cat's blood sugar levels out of whack, then the cat food's doing its job.
How dare you use logic