That's what has me baffled! We have this fancy piece of equipment that should maintain optimal conditions (how old are these recommendations and have they been verified with new tech?) yet a chicken does as a chicken does and still hatches chicks. Or, through having near perfect hatching conditions are we weakening the overall genetic pool by hatching sub-par chicks?
I was wondering if anyone has created a fake egg with temperature, humidity, and position sensors and placed it under a broody to really see what an egg experiences and then compare that to an incubator. What if temperature fluctuations actually help a chick develop? I was skim reading last night and it sounded like some cells grow better warmer and others cooler, so maybe the hen actually grows an embryo better than a steady state "perfect conditions" incubator?
If my friend doesn't need her incubators back until the spring, I have a few months to experiment to be sure I have everything well practiced for my "real" hatches next year

I'd definitely have to start processing some chickens if I did that though. I could have EE's and silkied EE's. I need a big heavy rooster, I have 2 absolutely massive BA's, one is pretty and one is hideous, but they dwarf all my other chickens and have a decent amount of meat. I could hatch out their eggs and probably have some decent dual purpose chicks.