Hmmm, I wonder what you would define as production breeds.Of course the brooding instinct has been bred out of production breeds. That is the primary means of making them production breeds. Self preservation, territory establishment, and lots of other things have been almost completely erased. No natural chicken would lay 200 eggs a year. They lay a clutch and set on them, only when conditions are right and they feel like it. You couldn't make much money in an egg production facility if your hens laid 30 eggs a year. If my hens eggs disappear from the nest, they consider it an unsuitable nesting site, and eat their eggs as soon as they lay them for a couple days until they turn off egg production. Once they turn it off, they won't start again until they are moved. You can replace their eggs, but only until there are a couple dozen at most, then they turn off egg production and set. The only way you can experience a chicken in it's natural form is to keep birds that haven't been dumbed down by selective breeding for egg or meat production. And you won't find birds like that at any hatchery or feed store.
Early chicken breeders selected birds that were too stupid to notice their eggs were missing, that didn't mind being in the proximity of other chickens that were nesting, that didn't set on eggs as soon as there was a clutch. You are basing everything on chickens that have had hundreds, perhaps thousands of years of being selected for unnatural traits. The birds traditionally used for hatching were always present, until recent times, when it became unfavorable to possess those birds, and as incubators became prevalent. Birds with all of their natural instincts intact, very different from what you get at hatcheries and feed stores today.
Would you define them by the number of eggs they lay each year?
What about the more common breeds in the USA favored by backyard flock keepers?
Some of these are in the 200+ eggs a year class yet they still go broody; not as easily or as regularly but they do it.
How about the various 'production' breeds (depending on definition) that have gone feral in a number of places and produced progeny?
I don't think it's quite as clear cut as your post above suggests.
I would however agree that the chickens that people buy at hatcheries and farm stores are markedly different to the jungle fowl and many game varieties.
I've got a study or two on comparative genetics somewhere. I might dig them up if I can find the interest.