I'm not a commercial poultry producer, but I am a -serious- poultry keeper. I went to an agricultural college and studied poultry science and gamebird management and other ag subjects, and at one time I might have gone into the professional end of poultry keeping or at least cooperative extension work. My grandparents kept chickens for completely pragmatic purposes, because they had to eat and to feed a family. I keep poultry for that reason and because, yes, I enjoy keeping fowl.
There are centuries, no, make that millenia, of poultry keeping methodology and practices. Some methods are more effective than others, but to think that our modern technology is always superior to traditional practices is a fallacy. Medicated feeds, hypersanitized facilities and monoculture may increase quantity of "food output" (i.e. eggs, meat) but it is not a sustainable practice for genetic diversity, disease resistance and ecological viability for the long run. It is only for short-term turn-around product production for profit.
I would rather see hundreds of thousands of backyard flock owners with genetically diverse flocks that are not pumped full of hormones and preemptive antibiotics -- vaccinated, yes, but otherwise allowed to develop natural disease resistance through good genes and good nutrition. Medication is fine within reason and used judiciously, but not if it's pumped prophyllactically into flocks so that "Super germs" can emerge and the birds have no natural resistance to any pathogen.
We would not raise our children in hyper-sanitized bubbles to keep out all pathogens, nor pump them full of hormones to make them grow faster. We wouldn't isolate them from socializing with other children and learning important social skills... while also being exposed to pathogens to which they would develop resistance and immunity. We wouldn't feed them medicated foods; we just wash the fruit under the tap and make sure the meat is thoroughly cooked and try to keep them from eating dirt and poop. We just observe reasonable care and caution in what they are exposed to and what they eat. They thus develop natural resistance, grow normally, and socialize well. Animal/poultry husbandry should be no different.
I wish just one person could give me a link showing where commercially raised chickens are given hormones.