The stuff I used to give my cat was fine, but she had kidney disease now and is on a prescription canned-only diet. The new stuff smells gross and it makes her poop smell much worse.

No, that was not it at all, according to her. It's that things that smell really good to the animals don't generally smell good to humans. She said it would be really easy to make food the animals would be excited about, but their owners would open the can and it would smell bad, so they didn't want to buy any more of it.

You've seen them eating literal poop, right?

You think you get high quality ingredients in store bought snacks and candy ?