I mean, sure that's good. But that's not most peoples birds. Not everyone wants game chickens and that's not the majority of chickens people own. That's like saying "Can wild chickens survive in the wild????" Yes. Duh. But the vast majority of people have domestic food-production style chickens and ask if they can just free range 24/7 like grandpa did and still expect eggs or good health or avoid mass predator losses and the answer is usually no. If you have ideal birds for wild living in a situation with tons of space and a good climate of course they're mostly gonna make it. But you're also giving up production.