I wonder how many people put as much research into the food they put on their own tables? Dogs evolved as scavengers, and will do surprisingly well on relatively crappy diets. A friend had a cross bred mutt that lived to be 19 years old, healthy as can be for most of his life (deaf as a post the last couple of years) and he ate the el cheapo stuff she got from the farm store, plus table scraps, his whole life.
Commercial dog food began as an invented product, and good advertising has made us believe we need it. Certainly people appreciate the convenience and have come to believe…...because of advertising.....that you need some sort of degree in nutrition to feed a dog (but not a child, apparently) Sure, it is great to get the "best" food (if you can figure out what that is), but many dog food brands are under the same parent multinational and even if you find a good, small, independent brand, keep an eye on it, as companies get swallowed up so quickly these days, formulas change (but not the name) and all of a sudden your favourite brand is no longer what you thought it was.
In reality, most dog food manufacturers use the cheapest ingredients they can get away with. There is nothing "fresh" or "natural" about commercial kibbles, with the processing that they go through. Without the "premix" they won't even support life. An ingredients list is great, but you need to know what actually qualifies as the ingredient stated. It may not be what you think. Most pet foods aren't made from anything you would want to put on your own table!
Full disclosure......I use a commercial food for convenience. Because I am vegetarian, table scraps are not going to cut it for me. I use NRG dehydrated, because I prefer something that doesn't use a pre mix. My dogs have done well on it, but before I bothered doing my research I had a couple of healthy Basenjis that lived to 16 on food I wouldn't use now.