"Cornish Cross Chickens are Not the Answer"
That depends on the question, I guess.
If you are a someone who is striving to limit the inputs from outside your own farm, I agree that Cornish Crosses would not be the answer. I think Buckeyes would fill that bill pretty well.
However, if you are looking to raise your own healthy meat and get a good bang for your buck, then I think Cornish Crosses are one of the best answers. You don't have to feed them the crap you get at tractor supply to grow them, and if you start them out foraging, they are really good at it, though the bigger they get the less good they are at chasing grasshoppers. But if a bug or tasty clover leaf is close to them, they are on it. They even stay up later and get up earlier so they forage longer each day than the other chickens.
If I get a bunch of chicks in March, and another in July, I have enough chicken to eat tucked into the freezer for the year and don't have to mess with them in the winter.
I feed my Cornish crosses the same thing as my layers. The main portion is what the local feed mill calls 'scratch grains'- a mix of whole grain hard and soft wheat, oats, sorghum, millet and milo, and cracked corn. It has 12% protein. I like that, other than the corn, the grains are whole.
I add a rice pot full of cooked lentils mixed with seaweed powder each day, along with scraps and garden waste and what they forage, and the chickens do well, both my layers and my meat chickens. However, I don't put the chicken's food in a feeder. If the weather is nice, it all gets kind of tossed all over the yard. If the weather is bad, the layers get fed in a bowl in their house, and the meat chickens get fed in smaller increments in their house.
For meat, I've eaten buckeyes and jersey giants as well as the roosters from my laying chick orders. So far the cornish cross have been the best tasting and largest, as large as the jersey giants were at 11 months.
I would agree about the lack of individual personalities. I find them all to be nice and friendly, with not one (so far) being mean or bossy. They like to come over and get a pat and pet when I am sitting in the yard and often, if I am sitting in the grass, one will come over to sit on my leg. And when they run they make me laugh every time, which I find to be an endearing quality. They do poop a lot. If you are able to save and compost it, that can be a good thing if you have a large garden.
The only other drawback I see with them is that they are not as fastidious about their hygiene as the layers. They have no problem walking around with skidmarks that would make a layer blush, and spend almost no time preening. For that reason I house them separately at night, so that I can clean their quarters much more often. Other than that, they spend the day with the layers.