Unfortunately this just isn't an option for everyone. Some people barely have enough time to cook for themselves or have a disability that may limit what they are able to do.Feed a homemade nutritionally adequate diet of just meat and vitamins, and you're set.
Raw food is a whole other debate too. Some people don't like the idea of handling raw meat because of salmonella and other foodborn illnesses. If they have a supreessed immune system it may not be an option.
I really don't think there is a one size fits all option for feeding animals, everyone has a different lifestyle. And like us, all cats dogs or whatever animals you have are individuals with different needs.