Interesting to hear.
I had some in the incubator at the same time I had a hen sitting on some. -- Then I decided I needed to move her, and she got confused about just where her nest WAS...pretty dumb on my part, I know. So she kind of 'abandoned the eggs...but then she went back to them.
Once the incubator eggs hatched, instead of putting them in a brooder, I put them under her at night---and wow, so nice to have the hen take care of chicks. No worries about power failure and not enough heat in the brooder, and no worries about them not getting enough exercise...she drilled them like a little army. It was so great to watch. And no need to clean the brooder etc.
Hen's do a lot of work for you, when they are the ones to raise the chicks. IMO it's better for the chicks too....but then you miss them thinking that you are their parent. That is kind of fun when they jump on your hand etc.....