I, for one, don't believe that chickens evolved or were all originally descendants of jungle fowl. I believe God designed certain animals as domesticated animals, specifically. Yes, we humans took a hand in selecting certain traits and mixing different breeds to develop certain traits but I've never believed that all chicken genetics can be traced to jungle fowl, no more than I think that all dogs were descendants of wild dogs or wolves.
As such, I don't think that all chickens are supposed to be on "jungle time" and we just force them to live in temperate climates and perform at our convenience. I've not seen anything yet in my lifetime to convince me of that. There are distinct breeds that are designed for~not by man....you could work on a tropical breed for hundreds of generations and still not have a bird that lays well and thrives in the northern climates~different areas of the world, just like most other animal and bird species.
No one was being critical at all of those who hatch in incubators, I was merely stating why I don't like to do so and giving those reasons....I question the need for it and also the timing of some hatches and the problems that arise from all of that. For me, it's a personal choice and if that means I'm just going in circles or not getting anywhere with my breeding, that's okay with me too. I've found that life is much easier and productive all the way around if I just don't fight God's design in this world. You folks are free to do whatever you please with your chickens and I reserve the right to do the same with mine.