Letting a hen raise the chicks is a thousand times easier than the box and heat lamp etc.
Some things I like about the hen hatching chicks it that the flock stays younger. And I get old stewing hens, which are great for canned chicken.broth. As well as young cockerels.
I can cull the chicken individuals that go against the “farm policy”. That is to say they don’t cooperate with my preferences.
And I can keep my favorites, I can have a whole flock of favorites.
I will admit though, I hate the slaughter process, with a passion! I have to meditate or say a prayer or center myself, or whatever you want to call it before each one I kill.
I don’t believe the hens whose eggs don’t hatch are depressed or emotionally distressed. I theorize that a hen just feels like it, and she gets a broody patch, and if the eggs don’t hatch, after a while she doesn’t feel like it any more, and walks away🤷🏻♀️.
Definitely, letting hens brood is part of chickens.