You have some very good points, but commercially raised birds are not unhealthy. If they were the producers could not stay in business. Hormones are never used in commercial meat bird production. One, because it is illegal, and two, because of advances in genetics it isn't necessary and is counterproductive. The commercial producers I know don't use antibiotics either. I don't think any of them do at this point in time.
People run into trouble with the Cornish X because they do not accommodate their quirks and they try to make the birds into something they are not. I had good luck with my Cornish X. I never tried a tractor because for me it just wasn't practical. I raised mine in a 12' x12' box stall in the barn that was well ventilated but not drafty. I bedded them on shavings, and I added shavings as necessary. I did not clean the stall until the chickens were gone. I had the feeders and the waterers hung on chains so the height could be adjusted as the chickens grew. They were high enough so the chickens had to stand tall to eat and drink. I had the feed on one side of the stall and the water on the other so the birds had to walk some to get from one to the other. They had feed available from seven in the morning to seven at night. I raised two batches a year. I ordered the first batch early enough in the spring so they would be gone before it got hot, and I got the second batch in the fall after the worst of the heat was gone. I lived in the San Joaquin Valley of California, and summers were very hot. I added Broiler Booster, a vitamin electrolyte supplement available from Murray McMurray to the water from start to finish. It really seemed to help with the leg and other issues the Cornish X are heir to. I kept my chickens longer than most people because I liked big roasters. I liked my chickens to dress out between 10 and 12 pounds. The biggest one dressed out at 16 but that is another story. When I processed them, I did not try to do them all at once. I just did two or three a day.
If you want plenty of meat in a short period of time, the Cornish X just cannot be beat. You will get more pounds of meat per pound of feed with the Cornish X than you can with any other chicken. However, they do have their quirks, and if you are unable or unwilling to deal with them, the Cornish X is not for you. I know this is a little long winded, but I thought some people might find it helpful.