I feed a home-made diet because I believe there is 'something' about commercial processed foods that makes them sub-optimal for the long term health of my cats. I would very much like to know what that 'something' is but I don't believe for an instant I'm going to learn what it is from Thixton.
My feelings on this are rather simple. I don't think there's necessarily anything to find. Yes, ingredients in much commercial pet food are of lower quality than human food, and though I haven't actually compared, I suspect that tolerances for contamination with various things may be of a wider range in pet foods than in human foods. But humans living on a low quality highly processed diet and never, ever eat any fresh food would be likely to not be as healthy as people eating high quality, fresh homecooked foods and/or fresh fruit and salad. For example.