I know I'm late to the party, but I wonder if broodies know more about the chicks than we do.
For instance, our first broody- Mama, a buff Orpington who was marvelous at her job, first hatched 6-- 5 five white 1 black, not a care in the world. She treated them all the same, didn't mind us handling or being in with her. But I had also accustomed our chicks early on to be messed with on nest to gather eggs easily. Her first brood she was about 6 months old
Second hatch all Easter eggers so random colors, but she only attacked one, who few weeks later died. Granted, we took them and raised them ourselves and even putting them back outside they all seemed okay but that one almost crashed instantly. Yes, that hatch had coccidiosis, but that one just seemed off as we looked back trying to figure out what to do next.
Third hatch we used incubator and a broody(she was a BCM/egger mix) she sat just fine. But when it came time to forage with the chicks she just flung them everywhere -- not intentionally I don't think, but front, backwards, to the side. Like they were "in her way" lol. (Maybe that's what's wrong with our current roo haha jk!, although he was one she hatched)
All in all. Broody definitely seems easier, thankfully haven't had any broodies since last Aug. (We sold our black Australorp and buff Orpingtons as they constantly went broody once a month. I didn't have enough broody jails lol we kept three, Mama being one, but she hasn't been broody since, knock on wood)
My only downfall to a broody is the first brood was feral- granted it could have been cross- SLW cross BO. The one black one was a Australorp/Orpingtoncross.
But with both our broodies we were able to check daily on them just as I could the incubator, so it was fun interacting with them.